What is the maximum size allowed for DETD fuses installed in a safety switch for a motor circuit?

In the context of safety switches for motor circuits, the maximum size for DETD (Dual Element Time Delay) fuses is governed by electrical codes and standards to ensure both safety and equipment protection. The correct answer is aligned with these regulations which specify that the maximum allowable size for DETD fuses in a motor circuit safety switch is 40 amps.

This limitation is put in place to prevent potential overcurrent conditions that could lead to overheating or damage to the motor, the switch, or the wiring. Larger fuses may not provide the necessary protection in scenarios where a motor experiences a stall or overload situation. By restricting the fuse size, the safety switch can effectively interrupt the circuit in case of a fault, thereby protecting both the electrical system and the connected apparatus.

In understanding this requirement, it's crucial to consider the balance between sufficient current capacity for normal operations and the need for protective measures in the event of fault conditions.