CC74 PWM Coil Economiser Module

The Albright Coil Economiser modules with Pulse Width Modulation (PWM) technology reduce continuous power dissipation of contactor coils down to 20% of nominal power.

The benefits are:
• Reduced coil heat dissipation
• Able to use a coil with intermittent power as standard
• Extends maximum voltage rating of coil
• Easy to use in new applications or for adapting existing ones

Utilising the latest low power microprocessor technology, the CC74 range can be used to drastically reduce coil power consumption and heat generation in existing applications. They can also be used in conjunction with highly powered intermittently rated contactors to allow continuous operation whilst maintaining very strong switching operation.

The CC74 module, initially supplies a short high power pulse to the contactor to pull it in, after which the voltage is automatically reduced to a lower holding level.

The CC74 module is available in two universal types covering voltages from 12V to 60V and 60V to 125V, where the final output voltage is a fixed ratio of the input voltage. Versions are also available that have a fixed, regulated output voltage. These regulated devices provide the optimum coil voltage without the need for any pre-regulation and can offer the opportunity for customers to use a single type of contactor with different supply voltage systems.

Technical Information

Pulse Width Modulation (PWM) technology is a common technique for coil economising in modern contactor applications. After an initial closing pulse the module regulates the coil down to the specified power dissipation (around 20%).

All Albright contactors with nominal voltages up to 96V are covered by the module types:
• CC74L is designed for applications from 12V up to 60V supply voltage
• CC74H is designed for applications from 60V to125V supply voltage

Furthermore, modules with the following operating modes are available:

Universal Module: This type of module provides an output voltage of 40% of the supply voltage.
Regulated Module: This type of module provides a constant regulated output voltage that is 40% of nominal coil Voltage, unaffected by changes in the supply voltage.