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🛒 PRODUCT GUIDE · for international procurement

Modular DIN-Rail AC Contactors & Transfer Switches from China — Wholesale Buyer's Guide

A practical sourcing guide for modular DIN-rail switchgear from China — written for electrical wholesalers, panel builders, and importers serving residential and commercial electrical markets. Real product images from asinele.com, HCH8 modular contactor model decoding, BSF transfer switch sizing, cross-reference to Schneider iCT / ABB ESB / Hager ESC equivalents, FOB pricing across quality tiers, certification matrix by destination market, and the procurement workflow that makes container-scale electrical wholesale economics work.

Manufacturer: Asinele (asinele.com)
Category: Electronics, Cables & Sensors
Reading time: 12 min

Modular DIN-rail switchgear — AC contactors, transfer switches, isolators, and timer relays in 17.5mm or 35mm modular widths — is the workhorse of every modern distribution board. Unlike the larger LC1D-form-factor contactors used for motor starting (covered in our LC1D AC contactor guide), these compact modular devices live inside the consumer unit or distribution panel and switch lighting circuits, HVAC contactor loads, water heater circuits, and provide manual transfer for backup-power applications.

The market for modular DIN-rail switchgear is enormous and consistently growing — driven by new commercial construction, residential electrical upgrades, hotel and apartment-building HVAC system installation, solar power transfer-switch retrofits, and ongoing replacement of aging panels in mature markets. Asinele's HCH8 modular contactor family and BSF transfer-switch range are positioned squarely in this market, cross-referenced to the major European and Asian brand families (Schneider iCT, ABB ESB, Hager ESC, Siemens Sirius modular).

Product range — actual catalogue images

The product images below are hosted on the manufacturer's official website (asinele.com) and link directly to the manufacturer's catalogue. Click any image to view the full specification page in a new tab.

HCH8-25 4P modular AC contactor — 25A 4-pole DIN-rail mount for lighting/HVAC switching.

HCH8-25 4P modular AC contactor — 25A 4-pole DIN-rail mount for lighting/HVAC switching.

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HCH8-63 2P modular AC contactor — 63A 2-pole, single-phase load switching.

HCH8-63 2P modular AC contactor — 63A 2-pole, single-phase load switching.

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HCH8-63 4P modular AC contactor — 63A 4-pole, three-phase load switching.

HCH8-63 4P modular AC contactor — 63A 4-pole, three-phase load switching.

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HCH8-100 4P modular AC contactor — 100A 4-pole, heavy lighting and motor circuits.

HCH8-100 4P modular AC contactor — 100A 4-pole, heavy lighting and motor circuits.

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BSF-163 manual change-over switch — 1-0-2 transfer for backup power circuits, 63A.

BSF-163 manual change-over switch — 1-0-2 transfer for backup power circuits, 63A.

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Product family — modular DIN-rail switchgear

Product familyFunctionModule widthCapacity rangeTypical FOB China unit
Modular AC contactor (HCH8 series)Switch lighting / HVAC / heater loads via 230V coil1-3 modules (17.5-52.5mm)16-100A, 1P/2P/3P/4PUSD 3.50-12.50
Modular impulse relayLatching relay for staircase / corridor lighting1 module16-32A, 1P/2PUSD 4.50-9.00
Modular timer relayTime-delay switching, 0.1s to 100h ranges1-2 modules16-32A multi-functionUSD 6.50-18.00
Modular changeover switch (BSF)Manual 1-0-2 transfer between two power sources1-3 modules16-160A, 1P-4PUSD 5.50-32.00
Modular isolator switchOn/Off isolation for circuit maintenance1-2 modules16-125A, 1P-4PUSD 3.00-14.00
Modular phase-failure relay3-phase voltage and sequence monitor1 module3-phase 380-415VUSD 8.50-22.00
Modular over-/under-voltage relayVoltage-out-of-range protection1 module1-phase 230VUSD 6.00-15.00

HCH8 modular contactor — model decoding

Asinele's HCH8 series follows the standard modular contactor naming convention used across the industry:

Code positionMeaningExample values
HCH8Series identifier (modular AC contactor)HCH8 = base series; HCH8N = with manual override; HCH8L = with indicator
-XX (rated current)Maximum continuous current16, 20, 25, 32, 40, 63, 80, 100A
-XP (pole count)Number of switching poles1P, 2P, 3P, 4P
Pole configurationNO/NC contact mix4NO (all normally-open), 2NO+2NC, 3NO+1NC, etc.
Coil voltageControl coil voltage24V AC, 110V AC, 220V AC, 230V AC, 240V AC, 380V AC

Standard pole configurations and their applications:

ConfigurationTypical use caseWiring
2P, 2NOSingle-phase resistive load (water heater, electric heater, single-phase motor)L-N switching, both poles open in OFF state
2P, 1NO+1NCSingle-phase with auxiliary signal contactMain load + status feedback to controller
3P, 3NOThree-phase motor without star-deltaL1, L2, L3 switching
4P, 4NOThree-phase with neutral switching (TT or IT earthing systems)L1, L2, L3, N switching
4P, 2NO+2NCReversing duty (cooling/heating mode switching)Two changeover circuits

Cross-reference to Schneider, ABB, Hager equivalents

Asinele HCH8 modelSchneider iCT equivalentABB ESB equivalentHager ESC equivalentApplication
HCH8-25/2P 2NOiCT25A 2NO (A9C20832)ESB25-20ESC22716-25A single-phase load
HCH8-25/4P 4NOiCT25A 4NO (A9C20834)ESB25-40ESC44716-25A three-phase + neutral
HCH8-40/4P 4NOiCT40A 4NO (A9C20844)ESB40-40ESC44040A three-phase load
HCH8-63/2P 2NOiCT63A 2NO (A9C20862)ESB63-20ESC263S40-63A single-phase heavy load
HCH8-63/4P 4NOiCT63A 4NO (A9C20864)ESB63-40ESC463S40-63A three-phase + neutral
HCH8-100/4P 4NOiCT100A 4NO (A9C20874)ESB100-40ESC48080-100A three-phase heavy load

BSF transfer switches — manual changeover for backup power

The BSF series provides a modular DIN-rail mounting solution for manual transfer between two power sources — typically utility (mains) and backup (generator or solar). The 1-0-2 lever positions correspond to:

Mechanical interlock prevents both sources from connecting simultaneously — this is a safety requirement to prevent backfeeding to the utility grid (which would energize utility lines downstream and create lethal hazard for line workers).

BSF ModelCapacityPole configTypical applicationFOB China
BSF-12525A1P or 2PSingle-room solar backup; small generator transferUSD 5.50-9.50
BSF-14040A2P or 4PApartment-level solar transfer; small home generatorUSD 8.50-14.00
BSF-16363A2P or 4PMid-size home generator (5-15 kVA); standard home solarUSD 12.00-22.00
BSF-1100100A2P or 4PLarge home / small commercial backupUSD 18.00-32.00
BSF-1160160A4PLight commercial / small industrial backupUSD 26.00-42.00

Manual transfer vs automatic transfer (ATS)

BSF series is a manual transfer switch — operator physically moves the lever to switch sources. This is the simplest, most reliable, and least expensive approach. Automatic transfer switches (ATS) sense utility loss and switch automatically — these are USD 80-450 for the same capacity range, plus require power for the control circuit.

For most residential and small commercial applications, manual transfer is sufficient and preferred — it eliminates ATS controller failures, doesn't require continuous control power, and forces a deliberate operator action that confirms backup power is available before transferring. For applications where automatic switching is critical (data centers, hospitals, telecommunications), use a true ATS, not a BSF series manual switch.

Coil voltage selection — common configurations

Modular contactor coil voltage must match the control supply available in the panel. Common configurations:

Coil voltageTypical use caseConsiderations
230V ACStandard for European, Middle East, Africa, AsiaMost common; energizes from same supply as load
110-120V ACNorth America, parts of Asia (Philippines, Japan)Verify exact destination market voltage
24V AC or 24V DCBuilding automation, industrial control panelsLower coil power; better for densely-packed panels with heat concerns
380-415V ACThree-phase coil, no neutral requiredLess common; used in industrial settings without neutral reference

Pricing brackets — what you should pay

Quality tierBuild qualityService lifeFOB China per unit (HCH8-63 4P)Premium brand equivalent
Premium aftermarket-fitSilver-tin contacts, full-housing flame retardant V-0, IEC 61095 compliant1,000,000+ operations electrical, 30,000,000+ mechanicalUSD 8.50-12.50Schneider iCT63A: USD 65-120
Standard wholesaleSilver-cadmium contacts, V-1 flame retardant housing500,000-800,000 operations electricalUSD 5.50-8.50—
BudgetBrass contacts, basic plastic housing100,000-300,000 operations electricalUSD 2.50-5.50—

Required certifications by destination market

MarketRequired certificationTest standard
European UnionCE marking, RoHSIEC 61095, EN 61095, EN 60947-4-1
UKUKCA marking (post-Brexit)BS EN 61095
Russia / EAEUEAC certificateGOST IEC 61095
USAUL listing for residential/commercial useUL 508 / UL 60947-4-1
Saudi ArabiaSASO certificateSASO 1825 / IEC 61095
South AfricaNRCS letter of authoritySANS / IEC 61095
BrazilINMETRO sealNBR IEC 60947-4-1
MexicoNOM certificationNOM-003-SCFI / IEC 61095

Container loading — distribution wholesale economics

Order tierMOQ (mixed SKUs)DiscountContainer utilizationLead time
Sample / dealer trial20-50 pcs each SKUList price; air courierDHL / FedEx3-7 days
Small distributor2000-5000 pcs total10-18% off20' container LCL15-25 days
Mid distributor10000-25000 pcs total18-30% off20' or 40' container25-40 days
Large distributor / private label50000+ pcs total30-42% off40HQ container x N40-60 days

A 40HQ container holds approximately 30,000-50,000 modular contactors and switches — these are small and lightweight (typical packaged unit: 200-400g for a 4P contactor). For a new electrical wholesaler, a typical first container mixes 50-150 SKUs covering the highest-velocity ratings (16A, 25A, 40A, 63A in 2P and 4P) plus a basic transfer switch range.

Order workflow — distributor procurement

  1. Local market analysis — establish dominant electrical infrastructure (220-240V single-phase or 380-415V three-phase, TT/TN/IT earthing systems, common installation practices)
  2. SKU list inquiry — provide cross-reference list of competitor part numbers (Schneider iCT, ABB ESB, Hager ESC); supplier returns FOB pricing, MOQ, lead time, certification options
  3. Sample order — 20-50 pcs each of top 30-50 SKUs by air courier; functional test on bench (continuity, coil pickup voltage, mechanical operation cycling)
  4. Certification verification — verify CE, RoHS, or destination-market certification (SASO / NOM / INMETRO / etc.) is current and valid for the SKUs ordered
  5. First container order — 5000-15000 pcs total mixed across 50-150 SKUs based on local electrical practice and typical building installation patterns
  6. Series replenishment — establish quarterly replenishment cycles; fast movers shift to monthly air freight on top-up basis
Manufacturer profile

Asinele on weisourcing.com

View the full supplier profile, certifications, contact details, and complete product catalogue.

Manufacturer · Electronics, Cables & Sensors

Asinele

asinele.com

Asinele — Chinese specialist manufacturer of low-voltage modular DIN-rail switchgear. HCH8 modular AC contactor series (16-100A, 1P-4P, multiple coil voltages); BSF manual transfer-switch range (25-160A, 1P-4P); modular impulse relays, timer relays, isolators, phase-failure and over/under-voltage protection relays. CHOSH house brand + private-label capability. Cross-reference for Schneider iCT, ABB ESB, Hager ESC, Siemens Sirius modular families. CE / RoHS / SASO / EAC / NRCS / INMETRO certifications.

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Frequently asked questions

What's the difference between an HCH8 modular contactor and a regular LC1D contactor?
Two main differences: form factor and typical application. LC1D contactors (covered in our LC1D AC contactor guide) are larger industrial-form-factor contactors mounted in their own footprint on the panel back-plate — typically used for motor starting and heavy industrial loads from 9A to 95A+. HCH8 modular contactors are 17.5mm-wide (or multiples) modular DIN-rail devices designed to live alongside MCBs and RCDs in a residential or commercial distribution board — typically for lighting circuits, HVAC contactor loads, water heater circuits, and similar building-integration applications. Same fundamental electrical function (electromagnetic switching of AC loads), different physical packaging and target applications. Both Asinele HCH8 and Schneider iCT (the equivalent Schneider product) are designed specifically for the modular DIN-rail consumer-unit environment.
Can the HCH8 modular contactor switch motors?
Yes for small motors, with caveats. Modular contactors like HCH8 are rated for AC-1 (resistive load) and AC-7a (mixed resistive/inductive household loads, like air conditioner indoor units, lighting) in their standard rating. For AC-3 (cage motor switching) the rating is typically derated by 30-50% — so a 25A AC-1 contactor might be rated for only 12-15A AC-3 motor switching. For dedicated motor starting, especially with frequent starting cycles, use a properly-rated motor contactor like the LC1D family. Modular contactors work well for small fixed-speed motors (single-phase 0.5-2.2 kW range) when properly derated and protected by an upstream motor-protection circuit breaker (MPCB). For three-phase motor applications above 2-3 kW, the LC1D form factor is more appropriate.
What does AC-1, AC-7a, AC-3 mean and which rating applies to my application?
These are utilization category codes from IEC 60947-4-1 that describe the type of electrical load and contactor performance under that load: AC-1 = non-inductive or slightly inductive loads, resistance heaters, ohmic load (highest contactor rating); AC-3 = squirrel-cage motors with start, plug, run cycle (significant contactor rating reduction due to motor inrush); AC-7a = slightly-inductive household loads in non-industrial environment, like AC unit fan motors and small refrigeration compressors (intermediate rating); AC-7b = motor-loads in non-industrial environment, hermetically-sealed compressors (lower rating, similar to AC-3). Application matching: residential lighting circuits, electric heating, water heaters → AC-1. HVAC indoor unit fans → AC-7a. AC outdoor unit compressors → AC-7b. Three-phase pump motors and conveyor motors → AC-3. The contactor must be rated to the worst-case category in your application.
How do I size a transfer switch (BSF) for backup power?
Transfer switch capacity must equal or exceed the larger of: (a) maximum simultaneous load drawn from utility, or (b) maximum simultaneous load drawn from generator/solar. Typical sizing: home backup at 5-7 kVA generator → 25-32A BSF on 230V single-phase; 8-12 kVA generator → 40-63A BSF; 15-25 kVA generator → 100-125A BSF. For 3-phase systems multiply current by appropriate factors. Critical: when sizing for solar transfer, the inverter's maximum AC output current is the deciding factor for "solar side," not the panel array DC capacity. For solar with battery backup, also verify the inverter's surge current rating (often 2-3× nominal for 1-2 seconds during motor starting) does not exceed the transfer switch's short-circuit rating. Always select 1-2 sizes above the calculated minimum for service-life and safety margin.
Are these certified for EU / UK / US / GCC residential installation?
Quality manufacturers provide certification packages covering most major markets, but certification per SKU is not automatic — you must specify required certifications when ordering. Standard certifications offered by Asinele and similar specialist factories: CE marking with EU Declaration of Conformity (covers EU and EFTA); RoHS certificate; UKCA for UK market (post-Brexit); EAC for Russia/EAEU; SASO for Saudi Arabia; NRCS LOA for South Africa; INMETRO for Brazil. UL/cUL listing for North American residential/commercial use is more specialized and adds significant cost — typically requires factory audit + per-SKU UL fee USD 800-2500 + ongoing surveillance fees. Most distributors targeting North American market either (1) limit themselves to UL-listed SKUs, (2) source from a different specialist factory that maintains UL listing, or (3) market only to industrial/OEM applications where UL listing isn't mandatory. Verify certification scope and validity before placing container orders — many serious cost surprises happen when expected certificates aren't actually held by the factory for specific SKUs.
Can I private-label these for my own electrical brand?
Yes — private label is standard. Branding levels: (1) Generic Asinele/CHOSH product + your sticker on shipping carton — no MOQ; (2) Your branded sleeve packaging with stock product — MOQ 200-500 pcs per SKU, NRE USD 100-300 for printing plate; (3) Your brand silk-screened on the device housing itself — MOQ 1000-2000 pcs per SKU, NRE USD 200-800 for silk-screen plate; (4) Custom housing color or special configuration — MOQ 5000+ pcs per SKU, NRE USD 1500-4500 for new injection-molding color tooling. Most successful electrical distributors use option (3) — branded silk-screen on device — as it provides strong brand identity at modest cost and is recognizable to electricians during installation. Critical certifications (CE, UKCA, SASO, etc.) for private-label products typically need to be re-issued in the buyer's name — plan 30-60 days extra for this paperwork during a private-label transition.

Related buyer's guides + inquiry articles

Asinele · Product Guide
LC1D AC Contactors from China — Wholesale Sourcing Guide

Companion guide for industrial-format motor contactors (LC1D-form-factor) from the same manufacturer.
Brazil · Inquiry
HVAC Spare Parts BOM — Brazil Maintenance Buyer

Real Brazilian buyer's HVAC plant maintenance BOM with cross-referenced LC1D / TeSys equivalents.
Pakistan · Inquiry
Electrical Insulating Mats — Pakistan Substation Refurbishment

Real Pakistani buyer's inquiry for IEC 61111 Class 0/1/2/3 insulating mats for electrical safety.
⚠ Important Disclaimer

Source: Product images on this page are hosted on the manufacturer's official website (asinele.com) and link directly back to that website. All product information was summarised from the supplier's public catalogue.

Brand mentions and trademark compliance: References to Schneider iCT, ABB ESB, Hager ESC, Siemens Sirius modular, and other manufacturer brands are made for the sole purpose of describing product family equivalence and recognized component-supplier benchmarks. Asinele is not authorized by, affiliated with, or endorsed by any of these brand owners. Products are aftermarket-fit cross-reference parts manufactured under Asinele's house brand (CHOSH) or buyer-private-label only. Buyers are responsible for ensuring product, packaging, and labeling do not infringe any third-party trademark in their import market.

Pricing & specifications: All price ranges, service-life figures, and certification scope reflect general market observation and may not apply to specific orders. Confirm current pricing, MOQ, certification holdings (current and valid), and configuration directly with the supplier. Certification scope per SKU varies — verify before container commitment.

Electrical safety caution: Modular DIN-rail switchgear interconnects with mains AC electricity at hazardous voltages and currents. Installation must be performed by qualified electricians familiar with local electrical code. Improper installation can cause fire, electric shock, and serious injury. Manual transfer switches (BSF series) require correct mechanical interlock to prevent backfeeding to the utility grid — ensure the switch model selected has proper interlock for the application. Asinele provides product to manufacturer-stated specifications; the buyer and end-user are responsible for installation per applicable electrical code and safe operation.

No middleman role: Weisourcing provides supplier discovery and editorial content. All transactions occur directly between buyer and supplier through the contact channels published on the supplier's official website.