This 3-pole isolator switch from Siemens lets you safely carry out maintenance work on an electrical device by cutting off its current supply from the main power source. It's easy to control using the black knob, which can be padlocked to prevent tampering and enhance safety. The unit is a reliable solution for regular use thanks to its high operating frequency of 50 switching cycles per hour. An operating temperature range of -25°C to +55°C makes it a versatile choice that's suitable for use in demanding industrial environments. Low power loss of 0.5W means it's also energy-efficient, even in heavy-duty applications. You'll typically find this type of switch used in HVAC (heating, ventilation and air conditioning) equipment.

• IP65 (ingress protection) rating indicates protection against dust and low-pressure water jets
• Voltage rating of 690V AC for use in high-voltage applications

While an isolator switch like this one is operated manually to gradually cut off the power supply in a device, a circuit breaker automatically shuts off power when it detects an electrical hazard.