SDKM1E Electronic Moulded Case Circuit Breaker

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SDKM1E electronic moulded case circuit breaker is used for circuits with frequency 50Hz (or 60Hz), rated insulation voltage AC800V, rated working voltage AC690V and below, and rated working current 800A. It takes the role of infrequent turn-on or turn-off and infrequent motor start-up. It has several intelligent protection functions, which includes overload long-delay inverse time protection, short circuit short-delay inverse time protection, short circuit short-delay definite time protection, short circuit instantaneous protection, under-voltage protection, as well as residual current protection (optional) and lack-phase protection (optional), to protect circuits and power unit from damages, avoid unnecessary power failure and improve power supply reliability.

Based on different rated ultimate short-circuit breaking capacities, this series of circuit breaker has two types: M type (medium high capacity type) and H type (high capacity type). It features small volume, high breaking capacity, short flashover and anti-vibration.

Product introduction

Working Conditions:
1. Altitude: <2000m
2. Ambient temperature: -5℃～+40℃
3. Resistant to moist air
4. Resistant to salt mist and oil mist
5. Installation category of the main circuit is III, that of auxiliary circuit and control circuit is II
6. Relative humidity not higher than 50% when the highest temperature is +40℃; higher humidity allowed if lower temperature; taking special measures if temperature change occasionally brings about condensation.
7. Maximum gradient: 22.5°
8. No explosion potential, and no gas or conducting dust that can corrode metals and destroy insulation.

Long-delay overcurrent inverse time protection operating characteristic:

Controller Type	Basic Type		Intelligent Communication Type, Programming Communication Type, Liquid Crystal Type
Current	Operating Time
1.05Ir1	No Operating in 2h
13Ir1	Operating if ≤1h
2Ir1	Inm=100A, 225A Setting Value t1 (S)	t1=(12, 60, 80, 100)s	12s-100s (Maximum Stepping 1s)
	Inm=400A, 630A, 800A Setting Value t1 (S)	t1=(12, 60, 100, 150)s	12s-100s (Maximum Stepping 1s)
Thermal Memory	30min, and Memory Removed if Power Failure (Optional Function for Intelligent Communication Type and Programming Communication Type)
	1. Operating Time in Conformity with “I²T₁=(2Ir1)²t1(1.2Ir1≤I

Short-delay over-current protection operating characteristic:

Current	Operating Time
Ir2≤I<1.5Ir2	Inverse Time		I²T₁=(1.5Ir2)²t2
1.5Ir2≤I	Definite Time	Setting Time t2(S)	0.06	0.01	0.2	0.3
		Allowed Deviation (S)	±0.02	±0.03	±0.04	±0.06
		Returnable Time (S)			0.14	0.21

Remark: allowed deviation of inverse time operating time is ±20%.

Short circuit instantaneous time protection operating characteristic:

Rated Current	100, 225	400, 630	800
Setting Current	Ir3=(4, 6, 7, 8, 10, 11, 12, 13, 14, 16) x Ir1	Ir3=(4, 6, 7, 8, 9, 10, 11, 12, 13, 14) x Ir1	Ir3=(4, 5, 6, 7, 8, 9, 10, 11, 12) x Ir1
Operating Characteristic		I≤0.85Ir3: No Operating I≥1.15Ir3: Operating