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Siemens ECQML12 mechanical interlock for circuit breaker

SIEMENS

SIEMENS ECQML12 Mechanical Interlock Circuit Breaker

SKU CH-C444-PX0Q6

Mechanical interlock for BQ circuit breakers with one pole rated at 12

  • TypeCircuit Breakers
  • Mechanical interlock prevents simultaneous breaker operation for safety
  • Single-pole design fits BQ circuit breaker panels
  • Siemens engineering ensures reliable electrical protection
  • New condition guarantees full manufacturer specifications
  • Essential accessory for proper circuit breaker installation

Siemens ECQML12 Mechanical Interlock

The Siemens ECQML12 is a mechanical interlock accessory designed for BQ series circuit breakers. It provides a physical barrier that prevents two adjacent breakers from being switched on simultaneously. This component is intended for electricians and facility managers who need to enforce safe changeover or load-shedding arrangements in residential or light-commercial panels. It fits single-pole devices and helps meet code requirements for interlocking.

Installation fits standard BQ breaker frames

The interlock snaps onto the toggle area of two neighbouring single-pole breakers, linking their movement mechanically. Most installers complete the job in minutes using only a screwdriver to secure the mounting hardware. The main issue arises when the panel interior is crowded; limited space between breakers or existing accessories can block the interlock from seating correctly. Verify that the adjacent poles are standard BQ models before starting.

Check that your panel uses Siemens BQ single-pole

The ECQML12 is built exclusively for that breaker family and will not fit other brands or frame sizes. Confirm you have exactly two adjacent single-pole positions available for the interlocked pair. Ensure the panel cover can close over the added height of the interlock assembly. No other electrical ratings or pole configurations are supported by this accessory.

Highlights

  • Mechanical interlock prevents simultaneous breaker operation for safety
  • Single-pole design fits BQ circuit breaker panels
  • Siemens engineering ensures reliable electrical protection
  • New condition guarantees full manufacturer specifications
  • Essential accessory for proper circuit breaker installation

Specifications

BrandSiemens
ModelECQML12
TypeCircuit Breakers

Questions about this item

How can I verify the mechanical interlock is functioning correctly after installation?

Confirm the interlock physically prevents both BQ circuit breakers from closing simultaneously by manually operating each breaker handle.

What components are included with the ECQML12 and what must be sourced separately?

The package contains the mechanical interlock assembly only; compatible Siemens BQ circuit breakers and mounting hardware are purchased separately.

Which version should I select for a single-pole BQ breaker application?

Choose the ECQML12 model designated for 1-pole configuration to match your single-pole BQ circuit breaker setup.

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