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Circuit breakers gain safety locking capability

21 January 2014

The NZM circuit breaker range, from Eaton, is now available with a safe key cylinder lock which is integrated directly into the attached rotary drive mechanism. 

The new safety lock enables the mechanical interlocking of two breakers, so that only the circuit breaker with the inserted key can be switched on. With the addition of the safe key users can now lock NZM circuit breakers and switch disconnectors in the ‘OFF’ position quickly and easily, ensuring that switches are protected against accidentally being switched on.
The locking mechanism is designed to increase the safety of machines and plant and improves work safety. Fast installation and activation of the switch-lock combination is possible due to the cylinder key being part of a preinstalled kit. The mechanical interlocking prevents switching on a circuit breaker, fulfilling disconnection properties as required by IEC/EN 60947-1 when in the ‘OFF’ position.
The interlocking system can be used for all frame sizes of the NZM circuit breakers and switch disconnectors. 

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