PTC thermistor triggering system needed

PTC thermistor triggering systems, which meet the following conditions, are permitted otherwise the conformity ceases to apply:

• Type-examination in accordance with Directive 2014/34/EU.
• Labelling according to the directive, at least II (2) G for use in gas atmospheres or II (2) D for use in dust atmospheres.

The PTC thermistor triggering system must be matched to the PTC thermistor inserted in the winding in accordance with DIN 44082 (see rating plate).

Tripping must occur:

• in the time stated on the rating plate Ta.
• in the event of excess temperatures on the PTC thermistors, i.e., in the stator winding of the connected motor.
• after a short-circuit in the PTC thermistor circuit.
• after a wire break in the PTC thermistor circuit.
• after the supply voltage fails in all three external conductors.

Once all causes of faults have been eliminated, the connected motor must not start up again automatically. It may only be switched on again manually (restart interlock).

For optimum protection, we recommend the MAICO MVS 6 PTC thermistor triggering system, type examined in accordance with Directive 2014/34/EU – please note the MVS 6 operating instructions.