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High Inrush Relays

Transformers, computer power supplies, electric motors and light bulbs typically have a high inrush current. This can be more than 10 times the operating current. The duration of the increased inrush current can be several milliseconds depending on the type of electrical load.

Switching arc between relay contacts   
(Foto: GUDE Systems)

                    computer power supply with 450 W output power can already cause an inrush current more than 30 A. Relays with inappropriate contact materials are prone to lead to a permanent welding of relay contacts. As a consequence, they can no longer be switched off. Such relays are typically used in low-cost electric appliances. In all GUDE devices switching at 230 V, only so called high inrush relays are being used. Besides the 16 A continuous current, these relays can withstand inrush currents of 80 A.




Benefits of High Inrush Relay

  • No sticking of the relay contacts
  • High reliability for switching operations
  • No downtime during operation
  • Avoidance of high maintenance costs
  • Compatibility with inrush current peaks:

      - max. 4 sec: 30 A
      - max. 20 ms: 80 A



High-Inrush-Relais in Expert Power Control 8035-1   
(Foto: GUDE Systems)

In the GUDE product range, the relays with high dielectric strength are installed in the following devices:

  1. Switched Power Distribution Units
  2. Remote Monitoring Systems


This comprises all products of Expert Power Control and Expert Net Control family.