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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.

TA Series Image
  • Bimetallic Amb. Compensated
  • Convertible Manual/Auto Reset
  • Setting Ranges Up To 310 Amps
  • Tripping Class 10A
  • UL; CSA Approvals
TA Series thermal overload relays are used in conjunction with ABB A Line contactors for the protection of motors having a nominal voltage of up to 600 VAC max per UL/CSA (690VAC and 800VDC per IEC). These relays are built to be self-protecting in the event of an overload until the short circuit protection device is activated.
  • Trip Indication
  • Optional Remote Trip/Reset
  • Single Phase and Unbalance Protection
  • Variety of Accessories Available
RW Series Image
  • Bimetallic Amb. Compensated
  • Convertible Manual/Auto Reset
  • Setting Ranges Up To 840 Amps
  • Tripping Class 10A
  • UL, IEC, CE Approvals
RW series thermal overload relays can be directly mounted under WEG contactors, assuring electrical and mechanical operation as an open across the line starter. The RW series is a perfect compliment to the CWC and CWM contactors. All sizes provide complete motor protection offering ambient temperature compensation, phase loss sensitivity protection, and current unbalance sensitivity.
  • Variety of Accessories Available
XT Series Image
  • 12~600 VAC/VDC Coils
  • Up to 640 HP @ 230V
  • Up to 1200 HP @ 460V
  • UL; CSA Approved
  • Up to 2000 Amps
The compact, space saving, and easy to install XT line of contactors is the efficient and effective solution for customer applications from 7A to 2000A. Non-reversing contactors are most commonly used to switch motor loads in applications where running over current protection is either not required or is provided separately.
  • 3 or 4 Poles
  • IP20 Finger and Back-of-Hand Proof
  • Large Ambient Temperature Range
  • Plug-In Accessories for Reduced Installation Time
  • Panel or DIN Rail Mounting up to 65A
TF42 Series Image
  • Continuous Temperature Compensation
  • 50/60 Rated D.C. Frequency
  • 690V Rated Insulation
  • Class J Fuse Type
  • Trip Class 10
  • 3 Poles
T16 Series Image
  • Overload protection- trip class 10.
  • Phase loss sensitivity.
  • Adjustable current setting for overload protection.
  • Trip-free mechanism.
Thermal overload relays are economic electromechanical protection devices for the main circuit. They are used mainly to protect motors against overload and phase failures. Starter combinations are setup together with contactors.
  • Direct mounting onto mini contactors or block contactors.
  • Suitable for three- and single- phase application
  • Automatic or manual reset selectable.
BF Series Image
  • Thermal Overload Relays between 0.09 and 420A
  • Independent or Direct Mounting on Contactor
  • Automatic and /or Manual Resetting
  • Non Phase Failure Sensitive Version
  • Thermistor Protection Relay
  • Phase Failure Sensitive
Lovato Motor protection relays thermal overload BF series are three poles three phase and non single phase sensitive.
BG Series Image
  • Thermal Overload Relays between 0.09 and 420A
  • Independent or Direct Mounting on Contactor
  • Automatic and /or Manual Resetting
  • Non Phase Failure Sensitive Version
  • Thermistor Protection Relay
  • Phase Failure Sensitive
Lovato Motor protection relays thermal overload BG series mini contactors are three poles three phase with single phase sensitive.
TF65 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
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