NDC Direct Replacement Circuit Breaker
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Hawker Siddeley Switchgear's NDC-DR is the latest addition to our range of DC Switchgear Products. The NDC-DR offers customers unrivalled circuit breaker technology utilizing magnetic actuator design, increased high speed performance, reliability and reduced maintenance. The NDC-DR circuit breaker is a plug and play product allowing users to replace old and obsolete DC breakers without modification to existing switchgear. Calibrated to specification, the NDC-DR is simply racked into position without the need for any auxiliary protection modification or commissioning. NDC-DR NDC Direct Replacement Circuit Breaker Key Features » Superior, proven Fit & Forget technology with minimal maintenance » A long service life designed to exceed 30 years » Superior compact design concept and operating mechanisms » High speed operation, direct overload and electrical tripping » Simple, reliable mechanism with no mechanical latch » Ergonomic, intuitive truck isolation and interlocking » Enhanced electrical and mechanical endurance » Patented Arc transfer coil » Fully bi-directional current interruption » Hard wearing main contact material (silver tungsten carbide) ensuring long life » Integrated operation with a wide range of circuit breakers The NDC-DR Replaces the following manufacturers: » Bertrum Thomas » GEC » PAMCO » Controlled Power (CPC) » English Electric » Other manufacturers available (please contact Whipp and Bourne Inc.) Rated Voltage V dc 800 1600 Rated Continuous Current A 4000/6000/8000 4000/6000 Rated Short-Time Withstand Current kAp/kA 100/72 100/72 Rated Track Time-Constant ms 210 210 Rated Short-Circuit Current kAp/kA 200/100 200/100 Mechanical Endurance* 50,000 operations 50,000 operations Rated Insulation Voltage kV 4.2 4.2 Control Voltage V dc 48/125/250 48/125/250 * before contact change, 50,000 x 5 with contact change RATINGS your power in safe hands HAWKER SIDDELEY SWITCHGEAR

NDC-DR Mechanical Features DIMENSIONS (In Inches) 1 4 3 5 7 6 8 2 Version 02 - Feb 2008. The design and manufacture of our products are subject to constant review, therefore slight variations may occur between the details given and the equipment supplied. The patented arc transfer system prevents internal contamination of the circuit breaker compartment. Secondary Contacts Fixed Contact Moving Contact Assembly Primary disconnects manufactured to suit switchgear The patented Magnetic Latch mechanism provides the primary means of ‘high speed’ tripping of the circuit breaker. Working in...