For failure to pick up or nuisance dropout, verify control voltage at the coil, inspect auxiliary interlocks and check for mechanical obstruction. For overheated contacts, examine load current, terminal torque, contact wear and upstream short-circuit protection.

Isolate both control and power circuits before resistance or continuity checks. Replace the device if the contact system or coil shows heat damage.

Match the complete A50-30-11 / 1SBL351001R8011 identity, coil voltage, pole arrangement and auxiliary-contact configuration. Confirm conductor size, overload relay coordination and protective device selection.

Mount upright with adequate ventilation, tighten terminals to documented torque and test the control sequence without load before normal operation.