Study on Coil Transient Voltage Suppression Methods for Contactors

doi:10.16628/j.cnki.2095-8188.2026.01.002

Abstract

Abstract:

Reverse transient voltage is generated during the de-energization of contactor coils,which may cause damage to the coil control circuit.Transient voltage suppression circuits are constructed respectively based on Zener diodes and varistors.The coil voltage waveforms and release time characteristics under different clamping voltages are compared and analyzed experimentally.It is found that the decrease of clamping voltage significantly prolongs the contactor release time,and under the same clamping voltage,the varistor-based suppression circuit results in a shorter release time compared with the Zener diode-based suppression circuit.

Key words: electromagnetic coil, transient voltage, Zener diode, varistor, release time

CLC Number:

TM57

GAO Mingyuan, HE Yubin, GU Zhihao, ZHANG Chao, REN Wanbin. Study on Coil Transient Voltage Suppression Methods for Contactors[J]. LOW VOLTAGE APPARATUS, 2026, 0(1): 9-15.

Figures/Tables 15

References 15

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参数	数值或类型
线圈电压/VDC	24
主触点负载电压/V	24
主触点负载电流/A	1
线圈电阻/Ω	68.8
线圈电感/mH	283.46
负载形式	阻性负载

钳位电压/ V	释放时间/ms					平均值/ ms
钳位电压/ V	第一次测试	第二次测试	第三次测试	第四次测试	第五次测试	平均值/ ms
30.0	4.258	4.268	4.269	4.272	4.266	4.267
27.0	4.373	4.383	4.366	4.367	4.396	4.377
18.0	5.614	5.645	5.618	5.619	5.642	5.628
15.0	6.154	6.141	6.162	6.151	6.178	6.157
10.0	7.923	7.987	8.078	7.962	7.918	7.974
6.2	10.978	10.883	10.908	10.984	11.018	10.954
3.0	13.141	13.162	13.131	12.956	12.992	13.076

钳位电压/ V	释放时间/ms					平均值/ ms
钳位电压/ V	第一次测试	第二次测试	第三次测试	第四次测试	第五次测试	平均值/ ms
39	3.484	3.471	3.486	3.483	3.485	3.482
27	3.779	3.778	3.793	3.793	3.804	3.789
22	4.264	4.271	4.267	4.271	4.289	4.272
18	5.169	5.161	5.186	5.182	5.177	5.175

参数	数值或类型
线圈电压/VDC	28
主触点负载电压/V	28
主触点负载电流/A	1
线圈电阻/Ω	57.8
线圈电感/mH	245.07
负载形式	阻性负载

钳位电压/ V	释放时间/ms					平均值/ ms
钳位电压/ V	第一次测试	第二次测试	第三次测试	第四次测试	第五次测试	平均值/ ms
30.0	5.289	5.313	5.303	5.314	5.292	5.302
27.0	5.453	5.454	5.444	5.366	5.411	5.426
18.0	6.858	6.889	6.891	6.864	6.797	6.859
15.0	7.493	7.456	7.468	7.424	7.449	7.458
10.0	8.902	8.975	8.958	8.924	8.924	8.937
6.2	10.404	10.301	10.322	10.317	10.366	10.342
3.0	11.846	11.841	11.829	11.877	11.928	11.864