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Electronic moulded case

Applicable scope

  • NYKM2E series electronic moulded case circuit breaker (hereafter referred to as circuit breaker), is one of new-type circuit breakers designed with CAD/CAM/CAE design, manufacturing technology, researched and developed. Its rated insulting voltage is 800V, applicable to AC 50Hz, rated working voltage till 400V, used for infrequent shift and infrequent motor start under rated voltage to 800A circuit. The circuit from rated working current to 800A is used as infrequent transferring and infrequent motor start.
  • Based on high and low breaking capacity (Icu) of its rated limit short-circuit, circuit breakers are divided into M type (relatively higher breaking type) and H type (high breaking type).
  • Circuit breakers can be installed vertically and horizontally.
  • Circuit breaker cannot have reversible incoming installation, namely, only 1,3 and 5 to connect power supply wires, 2,4 and 6 to connect load wires.
  • Circuit breaker applies to isolation, with symbol as "".
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Product Features

  • Selective cooperation: NYKM2E electronic moulded case circuit breaker has 3-section protection functions, Class-B circuit breaker and other circuit breaker protection devices connected to the same circuit have selective cooperation under short-circuit conditions;
  • It has 3-section protection action current and action time selection: User can do release setting adjustment according to load current requirements;
  • Self-powered: electronic release is supplied energy by circuit breaker itself, working power supply of current signal and release comes from current transformer installed inside circuit breaker;
  • "Pre-alarm" indication: when the actual running current flowing through circuit breaker reaches or exceeds pre-alarm action current Iro, “pre-alarm” LED on circuit breaker cover plate is in yellow;
  • Overload indication: when load current exceeds overload long-time delay action current, LED on circuit breaker cover plate is in red;
  • Large-current instantaneous release function: when circuit breaker closes or is operating, if it encounters short circuit large current (≥20Inm);
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Main Specifications and Technical Parameters

Type NYKM2E-100 NYKM2E-225
Breaking capacity level M H M H
Rated current 16、20、25、32、、36、45、50、55、60、65、70、75、80、85、90、95、100 100、125、140、160、180、200、225
Number of poles 3P，4P 3P，4P
Rated insulation voltage AC800V AC800V
Rated working voltage AC400V AC400V
Rated limit short-circuit breaking capacity (Icu) (kA) AC400V 65 85 65 85
Rated operation short-circuit breaking capacity (Icu) (kA) AC690V 35 50 35 50
Rated short-time withstand current (Icu) (kA/1s) AC400V 2 3
Cycle times of operation Power on ON 8000
Power off OFF 20000
Accessories Under-voltage release √ √
Shunt release √ √
Auxiliary contact √ √
Alarm contact √ √
Motorized operating mechanism √ √
Rotary handle operating mechanism √ √
Wiring terminal √ √
Installation and wiring mode Front-panel √ √
Back-panel √ √
Plug-in type √ √
Draw-out type — —

Note: On right of “/” in width “W” is four-pole width

NYKM2E-400 NYKM2E-630 NYKM2E-800
M H M H M H
200、225、250、280、315、350、400 400、420、440、460、480、
500、530、560、600、630		 630、640、660、680、700、
720、740、760、780、800
3P，4P 3P，4P 3P，4P
AC800V AC800V AC800V
AC400V AC400V AC400V
65 100 65 100 65 100
42 65 42 65 42 65
5 10 10
7500
10000
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