The new ZS earth leakage MCCB (Moulded Case Circuit Breakers) from NHP Electrical Engineering Products and Terasaki offers machine or personnel protection within a standard 125 A, 160 / 250 A MCCB frame size.
The ZS earth leakage MCCB, which is based on the TemBreak 2 MCCB range, also maintains the full functionality of a standard thermal-magnetic overload / short circuit protection device.
Protection against electric shock hazard can be provided by circuit breakers incorporating residual current protection.
Until now, MCCB’s incorporating an RCD in Australia and New Zealand, have been a combination type, where the circuit breaker is mechanically and electrically coupled to a residual current block.
These add-on residual current blocks increased the overall dimension of the device as well as the overall power consumption due to the additional load, sometimes requiring a derating of the host circuit breaker.
The new TemBreak 2 ZS integral RCD/MCCB’s, however, have the following advantages:
- A switchboard builder can use a switchboard, panelboard or chassis assembly designed for standard MCCB dimensions and mounting
- The residual current function is an integrated feature of the device, resulting in no increase in overall dimension or power consumption
- It is an easy upgrade from a standard MCCB to an Integral RCD / MCCB, as the dimensions and mountings are the same
- The ZS Integral Earth Leakage MCCB combination saves costs to the user, due to it being a combined device