Modular contactor range for machine builders

04 June 2013

WEG has announced the launch a new family of modular contactors – the CWB – which is said to offer reliability and security. The company is also enhancing its offering with user-friendly cage clamp technology.

Both, the motor protective circuit breakers MPW16 and the compact contactors CWC0 are now available with screw-less terminal technology.

WEG’s range of CWB contactors is reliable, flexible and  compact. For safety-related control functions, contacts are designed and tested as positively driven contacts according to IEC/EN 60947-5-1, Annex L and as mirror contacts according to IEC/EN 60947-4-1, Annex F.

Where a mirror contact is an auxiliary contact (NC, normally closed), it cannot be closed simultaneously with a main contact (NO, normally open) and as a result, special safety relays are no longer required. The contactors are suitable for global use meeting IEC/EN 60947 standards, and are UL certified for the North American market.

The contactors can be set up in combination with the MPW motor protective circuit breakers to operate as direct, reversing or star-delta starters. This fuse-less solution is said to be suited to the demands for switching and protecting electric motors allowing users to flexibly and cost-effectively tailor individual components or pre-assembled configurations to their application. The low power consumption of the contactor coils allows for direct and safe control via digital outputs of PLC, frequency inverter or soft starter.

The compact contactors are just 45mm wide allowing panel builders to optimise space in the cabinet and simplify the planning processy. This frame size applies to AC and DC power supplies (up to 18.5 kW/400 V). The mechanical interlock for reversing and star-delta starters is designed so that the user does not require additional space or any tools to operate it.

Surge suppressors can be integrated without the need to increase the depth of the devices. Two built-in auxiliary contacts (1xNO and 1xNC) are sufficient for a variety of applications. However, additional auxiliary contact blocks can be mounted at the front or side as required. The comprehensive modular switchgear portfolio comprises a matching range of accessories including easy connection kits and link adapters that help users save time and money.

WEG is also introducing its family of MPW16 motor protective circuit breakers, including accessories, which are now available with cage clamp technology. Since the accessories are upward compatible, the larger frame sizes such as MPW25 and MPW65 can also be equipped with auxiliary contact blocks in screw-less terminal technology. Additionally, cage clamp technology is made available for the compact contactors CWC0 for sizes up to 12 A (5.5 kW/400 V), which generally cover power ranges from 3 to 7.5 kW. As a result, all of WEG’s 3- and 4-pole contactors and the CWCA range of contactor relays now feature cage clamp technology.


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