Siemens 3RT1 Contactor, 220V ac/dc, 240 V ac/dc Coil, 3-Pole, 300 A, 160 kW 240V ac/dc, 2 NO/2 NC, 1kV

Looking for a switch that's not worn out by repetitive tasks? This Siemens reversing contactor is just what you need, as it's built to continuously make or break a high-current circuit without skipping a beat. The unit resists voltage surges, which protects components against the damaging effects of power spikes. It takes shock and vibration in its stride to meet the demands of harsh environments. An opening delay of 40 to 80ms makes the device quick off the blocks for an almost instant switching action. You can use this versatile contactor with both AC and DC circuits where high-efficiency motors switch equipment such as compressors, fans and gears.

• Screw terminals hold wires securely, so there's minimal need for re-tightening

The unit is finger-safe when touched vertically from the front, which reduces the risk of shock.