Protection equipment range
29 September 2010
Circuit & System Protection
Legrand’s range of protection equipment includes DPX MCCBs, trip-free switches, electronic earth leakage modules and specially designed accessories such as control signalling and motor operator units.
DPX MCCBs consist of a comprehensive selection of user-friendly auxiliaries that offer optimum efficiency, safety and easy installation. They are equipped with thermal magnetic or electronic releases. These MCCBs are available in six frame sizes with capacities of 125 A to 1600 A units up to 100 kA. All MCCBs have settable adjustments to suit the tripping requirements of the installation. Charts for association and discrimination between MCCBs and MCCBs are available, as well as between MCCBs and MCBs.
Control and signalling auxiliaries include fault signals that indicate the state of the contacts or the opening of the MCCB on a fault. Shunt trips and under-voltage releases allow the remote tripping of a DPX. Time lag (800 ms) under-voltage releases also prevent the false tripping in the event of AC supply micro breaks or micro control. These auxiliaries are common to all frame sizes.
New motors for DPX 125 to DPX 1 600 are designed for remote making and breaking of a DPX circuit and automatically reset in the event of a tripping on a fault. A lock prevents operation when working on the line. An electronic test unit is used for checking the operating characteristics of an electronic MCCB. Functions include identification of under-voltage release, monitoring of trip curves, measurement of internal temperatures of the device and memorisation of the number of occasions the device has tripped on a fault since installation.
Residual current relays and separate coils offer residual current protection on large diameter conductors to DPX MCCBs. It is advisable to fit a shunt trip or under-voltage release to the MCCBs or the switches used with them. The smaller frame sizes up to 250 A DPX circuit breakers can be DIN rail mounted under modular or special faceplates.
For more information contact Legrand, +27 (0)11 444 7971, [email protected], www.legrand.co.za
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