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Overload Relays

Reliable & Accurate Protection


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Product Features

  • Available in five frame sizes with a current adjustment range of 0.28-112A.
  • High fault short circuit current rating of 100kA@480V and 600V with Class J fuses.
  • Full load current adjustment ratio of approx. 1:1.5 enables relay to be set to exact FLA of motor.
  • Single phase sensitivity to protect motors against damaging phase loss conditions.
  • Manual or automatic reset and test modes, and stop button all in a single device.
  • Visible trip indication and test function standard on all c3controls Series 320 Overload Relays.
  • Thermal Trip Class 10 overload protection, trips within 10 seconds when carrying a current of 720%.
  • Ambient temperature compensation ensures reliable motor protection even in high temperature environments.
  • Direct mounting to all c3 contactors, miniature and standard.

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What is Overload Protection

When the motor draws excess current, it is referred to as an overload. This may cause overheating of the motor and damage the windings of the motor. Because of this, it is important to protect the motor, motor branch circuit, and motor branch circuit components from overload conditions.

Providing remarkable performance and motor protection through a wide range of features and functions

Need reliable, accurate overload and phase-loss protection for your motors? c3controls’ Series 320 Bimetallic Overload Relays provide unmatched protection and can be directly installed on all Series 300 Contactors, saving you time and panel space. Plus, cULus and CE markings make them applicable worldwide.

A wide range of features, functionality, and performance for the most demanding applications

c3controls’ Series 320 Bimetallic Overload Relays provide Trip Class 10 overload protection for single and three-phase motors, and phase loss protection for three-phase motors. Small size, ease of installation and outstanding features like IP20 guarded terminals with dual terminal markings, integral stop button and direct mounting will help you reduce your total installed costs.

Bimetallic

  • Five frame sizes
  • Selectable reset mode (manual or automatic)
  • Current Adjustment Range: 0.28 – 112A
  • Electrically isolated and integral 1 Normally Open and 1 Normally Closed auxiliary contacts
  • Ambient temperature compensation ensures reliable motor protection even in high temperature environments
  • Stop button for convenient and economical control circuit wiring
  • Provides thermal Trip Class 10 overload protection

Mounting Adapters

  • Separate mounting adapters enable Series 320 Overload Relays to be installed separately from a contactor on a 35mm DIN rail or with fixing screws to a panel

Reset Push Buttons

  • Designed to actuate the reset function of a Series 320 Overload Relay from outside of the enclosure
  • For use in an enclosure up to 254mm (10-inch) deep when used with our Series 320 Overload Relays. The rod can be easily cut to the desired length for use in a wide range of enclosure depths.

Enhance the features and performance of your equipment

Overload relays provide Trip Class 10 protection against overload and phase-loss conditions, and have ambient temperature compensation for motor protection in high temperature environments.

Proven

UL Listed and CE marked, our Series 320 Overload Relays are designed to perform in a broad range of applications.

High Fault Short Circuit Current Rating

High fault short circuit current rating of 100kA @ 480V and 600V with Class J fuses, provides safety and reliability in high fault applications.

Reliability

Trip Class 10 for reliable and accurate protection against overload conditions. Trips within 10 seconds when carrying a current of 720%.

Added Safety

IP20 guarded terminals with dual terminal markings prevent accidental contact with live parts.

Ask Our Experts – Customer Support and Engineers At Your Service!

Got questions? Our Customer First and Product Specialists welcome the chance to discuss your needs and answer your questions. Call 724.775.7926 or email us.

White Papers

Industrial Control Basics: Part 2 – Overload Relays

Electric motors are an integral component of industrial equipment, toys, vehicles, and electronic devices. They are designed to convert electrical energy into mechanical energy. These devices may be powered by AC or DC sources. Blowers, fans, compressors, cranes, extruders, and crushers are a few important devices equipped with electric motors.

This paper on Overload Relays covers the types of motors, explains overload protection, how an overload relay works, and the types of overload relays.

Media

The Basics of Induction Motors

Induction motors, also referred to as a synchronous motor, is one of the main types of AC electric motors used in commercial and industrial environments. These motors feature armortisseur windings, and work on the principle of electromagnetic induction. The electro-magnetic field in the rotor is produced by the rotating field of the stator. In short, the power is transferred to the rotor winding by stator through induction. There are two main types of induction motors — single-phase induction motors and three-phase induction motors.

Watch this video for an understanding on the inner workings of induction motors.

The Importance of Protecting Your Motor and It’s Components from Overheating

Electric motors are an integral component of industrial equipment, toys, vehicles, and electronic devices. They are designed to convert electrical energy into mechanical energy. These devices may be powered by AC or DC sources. When the motor draws excess current, it is referred to as an overload. This may cause overheating of the motor and damage the windings of the motor. Because of this it is important to protect the motor, motor branch circuit, and motor branch circuit components from overload conditions.

Watch this video to understand how an overload relay works to protect the motor and circuit from excessive heat.

Motor Control | Expert Insight | Ed Mallonen

With over 30 years of product research and development experience with Rockwell Automation/Allen-Bradley and Eaton/Cutler-Hammer, Ed Mallonen is uniquely positioned to comment on the essential attributes of a world-class product development organization. Ed draws on this experience, sharing insights on product design and development and c3controls’ line of Motor Control products noting, “It’s pretty darn impressive.”