Datasheet specifies contact rating as “Pilot Duty”

Datasheet specifies contact rating as “Pilot Duty”


The datasheet for DO-FA-12 says:

Contact rating .......................250 VAC/30 VDC, 2 A, Pilot Duty (Power Factor 0.35)

What does "Pilot Duty" mean?

Product Line

EcoStruxure Building Operation


  • Building Operation Automation Server Bundled (AS-B)
  • Building Operation IO-module


The datasheet specifies the rating class of the relays. 

Understanding what "Pilot Duty" means is needed in order to know what load can be controlled by the relay.


A "Pilot Duty" rating means that this relay is made for a specific highly inductive load, such as controlling the coil of another relay or contactor. Contacts with a "Pilot Duty" rating have passed standardized testing to prove they can reliably control a "Pilot Duty" load.

In another example the datasheet of a device may say:

Relay contact rating 250 VAC / 30 VDC, 2 A Pilot Duty (C300)

In this case C300 indicates the rating of the relay, according to the UL 508 standard.

The start current of a motor could damages the relays in case the current is too high. The start current could be up to 8 times the rated current, or more.

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