Page 663 - Motor_protection_and_control_Manual_motor_starters_ contactors

Surge suppressors for contactor coils

Technical data

Varistor RV5/50 RV5/133 RV5/250 RV5/440
Rated control circuit voltage Uc 24...50 V AC 50...133 V AC 110...250 V AC 250...440 V AC
24...50 V DC 50...133 V DC 110...250 V DC 250...440 V DC
Residual overvoltage (clipping voltage) 132 V AC 270 V AC 480 V AC 825 V AC
132 V DC 270 V DC 480 V DC 825 V DC
Opening time growth factor none
Operating temperature -20...+70 °C
Advantages High energy absorption: good damping - Unpolarized system.
Drawback Clipping as from Uvdr*, thus voltage front up to this point.
*Uvdr = Varistor operating voltage (voltage dependent resistor), tolerance ± 10 %.

RC type RC5-1/50 RC5-1/133 RC5-1/250 RC5-1/440
Rated control circuit voltage Uc 24...50 V AC 50...133 V AC 110...250 V AC 250...440 V AC
Residual overvoltage (clipping voltage) 2 to 3 x Uc max.
Opening time growth factor 2...3
Operating temperature -20...+70 °C
Advantages Very fast clipping - Attenuation of steep fronts and thus of high frequencies.
6

Transil diode RT5/32 RT5/65 RT5/90 RT5/150 RT5/264
Rated control circuit voltage Uc 12...32 V DC 25...65 V DC 50...90 V DC 77...150 V DC 150...264 V DC
Residual overvoltage (clipping voltage) 50 V DC 100 V DC 150 V DC 210 V DC 390 V DC
Opening time growth factor 1.1...1.2
Operating temperature -20...+70 °C
Advantages Good energy absorption - Unpolarized system - Simple, reliable system.
Drawback Delay on drop out which does not however reduce contactor breaking capacity.

Wiring diagrams
A1 A1 A1

A2 E0735D A2 E0734D A2 E0733D
Varistor RC type Transil diode

1SBC101602S0201

ABB | 6/39