A contactor is a heavy-duty, electrically operated switch that uses an electromagnetic coil to open or close its main power contacts, allowing remote on/off control of high-current loads such as motors, heaters, or lighting circuits. Unlike a small relay, it is built to handle frequent operation and large inrush currents, often includes arc-suppression chambers, and can be fitted with auxiliary contacts for signaling and interlocking.
Definite purpose contactors act as thermostat-controlled on–off switches that close circuits when temperatures rise. Constructed with silver poles to ensure even heating and cooling as well as long life, each definite purpose contactors made by Littelfuse meets NEMA standards and complies with the A2L refrigerant requirement of UL Category Control Number (CCN) LZGH2/8 for Annex JJ of UL 60335-2-40.
EVs and industrial electronic control systems need robust power management solutions. Littelfuse’s high-voltage dc contactor relays meet those needs while also providing high-current circuit protection. Our contactor relays come with continuous current ratings up to 500 A and maximum voltage ratings up to 1.8 kV dc. Some versions incorporate pulse with modulation (PWM) technology to reduce power demands for keeping contacts closed. Common applications include EV...
