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Overload Relays

Overload Relays
Overload Relays
Overload relays are electrical devices designed to offer reliable protection for motors in the event of overload or phase failure.

These types of relays are used to protect against a running overcurrent that would cause overheating in a motor. Instead of instantaneous trip characteristics found in circuit breakers, fuses and overcurrent relays, overload relays monitor current over time.

Thermal overload relays have a bimetallic strip that bends when heated to a set temperature. When excessive current heats the relay to that setpoint, the contactor de-energizes and interrupts power to the motor.

Electronic overload relays use electronics to constantly monitor current, instead of relying on heat to trip a contact coil. These relays often offer adjustable current ranges, protect against phase loss, and can automatically reset.

Overload relays are marked by Class (Class 10, 20 and 30), which indicates the response time of the relay.

EF19 Series Image
  • Overload protection trip class 10E, 20E, 30E selectable
  • Adjustable current setting for overload protection
  • Temperature compensation from -25 +70 C
  • Automatic or manual reset selectable
  • Phase loss sensitivity
Electronic overload relays offer reliable protection in case of overload and phase-failure. They are the alternative to thermal overload relays. Motor starters are combinations of overload relays and ontactors.
EF45 Series Image
  • Overload protection trip class 10E, 20E, 30E selectable
  • Adjustable current setting for overload protection
  • Temperature compensation from -25 +70 C
  • Automatic or manual reset selectable
  • Phase loss sensitivity
Electronic overload relays offer reliable protection in case of overload and phase-failure. They are the alternative to thermal overload relays. Motor starters are combinations of overload relays and contactors.
TF96 Series Image
  • Overload protection trip class 10
  • Phase loss sensitivity
  • Temperature compensation from -20 to 60 C (-14 to 140F)
  • Adjustable current setting for overload protection
  • Automatic or manual reset selectable
  • Suitable for three- and single-phase application
  • Trip-free mechanism
  • Status indication
  • STOP and TEST function
  • Direct mounting onto block contactors
  • Sealable operating elements
EF370 Series Image
  • Overload protection-trip class 10E,20E,30E selectable
  • Phase loss sensitivity
  • Adjustable current setting for overload protection
  • Automatic or manual reset selectable
  • Sealable operating elements
  • Self-supplied devices
The EF370 is an self-supplied electronic overload relays,which means no extra external supply is needed.It offers reliable protection for motors in the event of overload or phase failure.Easy to use like a thermal overload relay and compatible with standard motor applications,the electronic overload relay is convincing,above all,due to its wide setting range, high accuracy,high operational temperature range and the possibility to select a trip class (10E, 20E, 30E).Further features are the temperature compensation,trip contact (N.C.), signal contact (N.O.),automatic or manual reset selectable,trip-free mechanism,STOP and TEST function and a trip indication.The overload relays are connected directly to the contactors.
EF Series Image
  • Overload Protection Trip Class
  • Sealable Operating Elements
  • Adjustable Current Setting
  • Stop and Test function
  • Phase Loss Sensitivity
  • Trip Free Mechanism
  • Self supplied Device
  • Status Indication
EF205 Series Image
  • Overload protection-trip class 10E,20E,30E selectable
  • Phase loss sensitivity
  • Adjustable current setting for overload protection
  • Automatic or manual reset selectable
  • Sealable operating elements
  • Self-supplied devices
The EF205 is an self-supplied electronic overload relays,which means no extra external supply is needed.It offers reliable protection for motors in the event of overload or phase failure.Easy to use like a thermal overload relay and compatible with standard motor applications,the electronic overload relay is convincing,above all,due to its wide setting range, high accuracy,high operational temperature range and the possibility to select a trip class (10E, 20E, 30E).Further features are the temperature compensation,trip contact (N.C.), signal contact (N.O.),automatic or manual reset selectable,trip-free mechanism,STOP and TEST function and a trip indication.The overload relays are connected directly to the contactors.
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