Service plug 4-pole for 2.stage

4-pin standard plug for service work for manual switching of 2-stage oil or gas burners. Disconnect the stage 2 plug on the boiler side and plug in the service plug. The actuator can now be moved manually to stage 1, stop or stage 2 during burner maintenance. This is essential for any service engineer who has to carry out measurements. Once the maintenance work has been completed, the boiler plug is replaced and the burner regulates stage 2 again via the control system.