Description
The WM1L is a moulded case residual current circuit breaker for AC 50 Hz circuits rated 400 V and up to 630 A, with a rated insulation voltage of 800 V. It adds earth-fault (residual current) protection to the overload, short-circuit and under-voltage protection of a moulded case breaker, guarding against long-standing earth faults that overcurrent protection alone cannot detect.
Protection
- Overload, short-circuit and under-voltage protection.
- Residual current protection against persistent earth faults.
- Helps reduce the risk of fire caused by earth-fault currents.
Where it fits
- Distribution boards where earth-leakage protection is required.
- Motor and machinery circuits exposed to insulation faults.
- Installations where fire risk from earth faults must be limited.
Selection and ordering
Confirm the system voltage (400 V), the load current, the residual current sensitivity required and the pole configuration. We will confirm the correct model and provide a quotation.
FAQ
How does the WM1L differ from the WM1?
The WM1L adds residual current (earth-leakage) protection, so it also guards against long-standing earth faults that overcurrent protection alone cannot detect.
When is residual current protection needed?
Where earth-leakage current may not be cleared by overcurrent devices, for example circuits exposed to insulation faults, to reduce fire risk.
Can you build to my specification?
Yes. CWNE develops and produces special types and specifications to customer samples, drawings and technical requirements.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
