Auxilary contactor

Choose the contactor based on the operating current Ie and the motor’s power so that starts and switching work reliably. For example, a 95 A model can support up to 45 kW in a 3-pole configuration with 1NO+1NC, suitable for medium to heavy loads. Other variants exist with 65 A, 40 A, or 32 A—indicating capacities of 15 kW to 20 kW depending on voltage and usage for AC 3/AC 4. Your choice will depend on your motor setup and your switching requirements.

The available coils include 220/230 V AC, 110 V AC, and 24 V AC, all designed for industrial systems. Each model is equipped with an auxiliary contact 1NO+1NC and mounts on a DIN rail or directly onto a panel. This versatility makes it easy to integrate the contactor into existing electrical enclosures and ensures safe switching across different load levels, while staying compatible with 3P configurations and associated protections.

Ideal for non-reversing motor starting and control in industrial installations and control panels, these contactors are suitable for both maintenance technicians and systems engineers. Models range from a small 9 A up to 95 A for loads from a few kilowatts to nearly 45 kW. In MCC or electrical panels, they provide clean, reliable switching, including low-voltage control versions for safety and control systems.

Confirm the contactor is used within the specified operating range and the correct AC3/AC4 category suitable for your motor. It’s strongly recommended to pair the contactor with a matching thermal relay for effective motor and cable protection. IP20 versions and environments up to 40 °C are common, with altitude tolerance up to 2000 meters. Also ensure DIN-rail or panel mounting is secure and that electrical connections follow CE standards and equivalent requirements.

Ith refers to the admissible thermal current, Ie is the operating current, Ui is the insulation voltage, and AC3/AC4 describes the usage category. For example, a 95 A contactor offers Ie = 95 A at 380/400 V in AC3 and 44 A in AC4, with Ui of 690 V and Ith of 125 A. Other models show different Ie values (65 A, 40 A, 12 A) along with corresponding motor power ratings, illustrating how nominal current, voltage, and contactor use relate within a specific application.

Yes. It’s recommended to pair these contactors with a thermal relay appropriate for the motor load. This combination quickly cuts the circuit during overloads and protects both the motor and wiring. This kind of technical recommendation is often explicitly stated in datasheets, helping provide complete and reliable protection in industrial electrical systems and automated setups.