Electronic Overload (ABB)
Electronic overload relays are the alternative to thermal overload relays. An electronic overload relay offers reliable and fast protection for motors in the event of overload or phase failure. Starter combinations are setup together with block contactors and mini contactors.
Overview
Thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. Starter combinations are setup together with block contactors and mini contactors.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
Characteristics of thermal overload relays: TF range
- Trip class 10
- Ambient air temperature – operation: -25°C +60°C
- Sealable cover for operating elements
Characteristics of thermal overload relays: T16 range
- Trip class 10
- Ambient air temperature – operation: -25°C +60°C
Characteristics of thermal overload relays: TA DU range
- Trip class 10A
- Special version with trip class 20 or 30*
- Ambient air temperature – operation: -25°C +55°C
- Special versions, suitable for protection of EEX e motors*
General characteristics of thermal overload relays
- Manual or automatic reset selectable
- Trip-free mechanism
- Phase loss sensitivity acc. to IEC/EN60947-4-1
- 2 electrically isolated auxiliary contacts – 1 NO + 1 NC
- Test and STOP function
- Trip indication on the front
- Temperature compensation
- Useable for AC- or DC-application*
- Suitable for three- and single-phase applications
- All phase are equipped with bimetal tripping elements
- All terminal screws are accessible from the front
Available accessories
- Single mounting kit*
- Busbar kits *
- Terminal shrouds*
- Remote trip and remote reset *
- Electronic overload relays are the alternative to thermal overload relays. An electronic overload relay offers reliable and fast protection for motors in the event of overload or phase failure. Starter combinations are setup together with block contactors and mini contactors.
ABB offers one of the widest electronic overload relay assortments on the market.
Characteristics of electronic overload relays range
- Trip class 10E, 20E, 30E selectable
- Self-supplied
- Manual or automatic reset selectable
- Trip-free mechanism
- Phase loss sensitivity acc. to IEC/EN60947-4-1
- 2 electrically isolated auxiliary contacts – 1 NO + NC
- Test and STOP function
- Trip indication on the front
- Temperature compensation
- Ambient air temperature – operation: -25°C +70°C
- All terminal screws are accessible from the front
- EF range: Sealable cover for operating elements
Available accessories
- Separate mounting*
- Busbar kits *
- Terminal shrouds*
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