VH overheat protection relay
The VH relay is intended to protect industrial electric equipments (first of all motors, but also electric furnaces, welding,
X-ray equipment, etc.) against harmful overheating.
Thermistor should be built in protected parts of equipment which must be connected series and to the VH relay.
Features of PTC protection (compared with bimetallic protection):
- one VH relay can protect both winding and bearings of motor;
- it is impossible to disable the operation of the relay or to destroy the efficiency and precisity of protection by handling;
- protection can be performed in case of failures that do not cause harmful increase of current consumption of the motor;
- while utilizing maximum power of the motor protection is guaranted
against heavy starting repeated breaking, phase failure, too high or
too low supply voltage, high or changing switching frequency.
|Rated insulation voltage
||250 V AC
|Rated control supply voltage (Uc)
||24; 42; 110;
230 V AC
+ 10 ... - 15%
||max. 800 ohm
||2,5 +- 0.5 kohm
|Degree of protection
The detailed technical description of the product family is in the printed catalogue
"TIMERS MONITORS ELECTRIC DEVICES FOR INSTALLATION"
For further information see the