Auxiliary Contactors

 Auxiliary Contacts and Contact Blocks for Industrial Switching and Signaling

Auxiliary contact blocks are critical components used to extend the functionality of contactors, miniature circuit breakers (MCBs), and relays. Whether for status signaling, interlocking, or control logic, these low-current switching elements help systems communicate effectively — especially in automation, power distribution, and safety-critical installations.

We supply a full range of contactor auxiliary contacts and circuit breaker auxiliary contact accessories for panel builders, OEMs, and MRO operations — with direct EU stock and expert-level matching for branded systems.

Where Auxiliary Contacts Are Used — and Why They Matter

Auxiliary contactors are used not for carrying load current, but for switching auxiliary circuits. Their main applications include:

• Signaling circuit state (ON/OFF, tripped, remote indicator)
   
• Interlocking multiple contactors in motor reversal setups
   
• PLC input triggering from contactor switching events
   
• Secondary safety control, such as opening control relays upon fault
   

In MCCs, automation cabinets, and field-mounted enclosures, using the right auxiliary contact ensures system integrity without overloading control circuits.

Mounting Formats and Integration Options

Auxiliary contacts come in multiple types depending on where and how they're used:

• Front-mounted contact blocks — fast clip-on for MCBs and modular contactors
   
• Side-mounted auxiliary contactors — standard on ABB, Siemens, Schneider frames
   
• Contactor with auxiliary contacts pre-fitted — often found in compact starters
   
• Plug-in relay auxiliary contact sets — DIN-mount compatibility for signal relays
   
• MCB with auxiliary contact capability — used for monitoring tripped breakers remotely
   

Our lineup includes both normally open (NO) and normally closed (NC) options, with various contact ratings for 5–10 A control voltage lines.

Available Brands and Models in Stock

We hold real-time stock of the most in-demand auxiliary contact modules across:

• Schneider Electric – LADN, GVAD, and A9N accessory ranges
   
• ABB – CA5-10, CA6-11M, and S2 series add-ons
   
• Eaton– DILM auxiliary blocks, FAZ accessories
   
• Siemens – 3RH2 and Sirius modular kits
   
• Legrand – DX³ and TX³ side contacts and trip indicators
   
• Hager – for MCBs and modular contactors (MC models)

Most modules support snap-on mounting, labeled terminals, and IEC/UL compliance for cross-border panel designs.

Technical Details That Matter in Procurement

• Voltage rating: Up to 690V AC / 250V DC depending on model
   
• Current rating: 5–10 A switching capacity
   
• Terminal style: Screw clamp, push-in, or spring-type
   
• Contact material: AgNi or AgSnO₂ for high conductivity
   
• Certifications: CE, VDE, UL, IEC 60947-5-1 or EN 60947-4-1
   
• Positioning: Side, front, or top-mounted; contact codes clearly marked
   

We provide full datasheets and compatibility charts for matching auxiliary contactors to existing breakers, starters, or relays.

Why Order Auxiliary Contact Blocks from Bank of Lamps

We are a wholesale-only distributor working across Europe since 1997, supplying auxiliary contacts and switching accessories to electrical contractors, panel builders, and industrial procurement teams.

What you get with us:

• Full access to auxiliary contactor stock across certified EU brands
   
• Support for small batch (from 20 pcs) to pallet-scale orders
   
• Dispatch from our 5,100 m² bonded warehouse with EU-wide delivery
   
• Assistance in matching mcb auxiliary contact parts to your existing frames
   
• Zero-retail model — only for B2B, with transparent terms and real-time stock