Brand: ABB

ABB EF370-380 Electronic Overload Relay 115-380 A

Name: ABB EF370-380 Overload Relay 115-380 A | Seven Star LLC
Brand: ABB
SKU: EF370-380

Description

EF370-380: top-of-range electronic overload relay

EF370-380 is the highest-rated ABB EF relay in the data sheet, with a setting range of 115 to 380 A. The ABB e-catalogue pairs it with AF265 to AF370 contactors, including the AF265-30-11-13 and AF370-30-11-13 on this site.

It is self-supplied, rated 1000 V AC and provides one N.C. trip and one N.O. signal contact with automatic or manual reset selectable.

Technical specifications

Parameter	Specification
Type designation / order code	EF370-380 / 1SAX611001R1101 (EAN 4013614442216)
Device type	Self-supplied three-pole electronic overload relay, no external supply needed
Current setting range	115…380 A
Trip class	10E, 20E or 30E, selectable
Protection features	Overload and phase-loss sensitivity; temperature compensation; trip-free mechanism; STOP and TEST function; status indication
Reset	Automatic or manual, selectable
Contacts	1 N.C. (95-96, trip) + 1 N.O. (97-98, signal)
Rated operational voltage / insulation	1000 V AC; Ui 1000 V; Uimp 8 kV
Short-circuit protective device	1600 A gG fuse (UL: 800 A class L or T, SCCR 18 kA)
Connection (main)	Bar connection, torque 28 Nm
Suitable contactors	AF265 … AF370 per ABB e-catalogue
Dimensions / weight	105 mm wide x 187.6 mm high x 122.8 mm deep; 1.338 kg
Auxiliary circuit	600 V AC/DC; 6 A gG fuse for the contacts
Ambient temperature	Operation -25…+70 C (temperature compensated); storage -50…+85 C
Standards	IEC/EN 60947-1, 60947-4-1, 60947-5-1; UL 60947 series

Protecting 90-200 kW motors

A 115 to 380 A scale covers motors from roughly 55 kW to 200 kW at 400 V. IEC short-circuit protection is a 1600 A gG fuse, and the UL table gives an 800 A class L or T fuse with 18 kA SCCR. Tightening torque for the bar connection is 28 Nm.

The relay is 105 mm wide, 187.6 mm tall and 122.8 mm deep, weighing 1.338 kg. ABB states a high accuracy and a wide operating temperature range, with temperature compensation from -25 to +70 C.

Practical selection notes

Select the trip class from the starting time: 10E for normal, 20E or 30E for heavy starts such as large fans or crushers. Trip class is selected on the front, so it can be changed during commissioning.

If the motor current is below 115 A the EF205-210 gives better resolution; above 380 A this relay is outside its range and a different protection arrangement is required.

Remember the general rule printed in ABB’s EF data sheets: the relay must itself be protected against short-circuit, so the 1600 A gG fuse (or the UL fuse in your region) belongs in the feeder design. The data sheet also lists the 1000 V rated operational voltage and conformity to the RoHS Directive 2011/65/EU, which can be quoted in tender submittals.

Documents and quotation

The linked file is ABB EF205 and EF370 electronic overload relays data sheet 2CDC107040C0201. Seven Star LLC supplies the EF370-380 on request from Muscat, with availability and lead time confirmed in the quotation. Related motor-starter parts are in the Contactors and Overload Relays category, including the ABB TA25DU1.4 thermal overload relay.

Confirm before ordering: motor full-load current and the trip class your process needs, the contactor frame it will mount on, and the short-circuit device in your feeder.

Datasheets & Documents

Datasheet ABB EF205 and EF370 electronic overload relays data sheet 2CDC107040C0201 Download

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About brand

ABB is the Swiss-Swedish engineering group for electrification and automation: low voltage drives, motors, circuit breakers and motor control, process instruments and analysers, control systems and robots. It was formed on 5 January 1988 by the merger of two older companies. ASEA was founded in Västerås, Sweden, in 1883 by Ludvig Fredholm to make electric lighting and generators. BBC Brown Boveri was founded in Baden near Zurich in 1891 by Charles E. L. Brown and Walter Boveri. ABB Ltd is incorporated in Switzerland, headquartered in Zurich and listed on the SIX Swiss Exchange and Nasdaq Stockholm.

ABB company profile

Formed	5 January 1988, by the merger of ASEA (Sweden) and BBC Brown Boveri (Switzerland), each holding 50%
ASEA	Founded 1883 in Västerås, Sweden, by Ludvig Fredholm; first products electric lighting and generators
Brown, Boveri & Cie	Founded 1891 in Baden, Switzerland, by Charles E. L. Brown and Walter Boveri
Headquarters	Zurich, Switzerland; ABB Ltd became the group holding company in 1999
Ownership	Public company listed on SIX Swiss Exchange and Nasdaq Stockholm
Brands in the group	Baldor (US motors, acquired 2011), B&R (machine automation, acquired 2017), K-TEK level instruments, Endura and Navigator analysers, SACE breakers
Product families	Low and medium voltage drives (ACS series), motors, SACE Tmax and Emax breakers, contactors and soft starters, flow, pressure, temperature and level instruments, liquid and gas analysers, Contrac actuators, AC500 PLCs, Ability System 800xA and S800 I/O, protection relays, robots

Milestones

1883: ASEA is founded in Västerås, Sweden.
1891: Brown, Boveri & Cie is founded in Baden, Switzerland.
1987–1988: The merger is announced on 10 August 1987; ABB Asea Brown Boveri starts operating on 5 January 1988.
1999: ABB Ltd, incorporated in Switzerland, becomes the single holding company of the group.
2011 and 2017: Baldor Electric and B&R join ABB.
2020: ABB sells its power grids business to Hitachi, focusing on electrification, motion, process and machine automation.

Choosing an ABB drive

ABB's ACS drive codes are easy to read once you know the pattern. In ACS580-01-046A-4, "ACS580" is the drive family, "01" means a wall-mounted single drive, "046A" is the rated output current (about 46 A) and "-4" means a 380–480 V supply. The family is chosen by application: ACS355 for compact machinery, ACS310 for simple pumps and fans, ACS580 as the general-purpose drive, ACQ580 for water and wastewater with pump functions such as pipe fill and dry-run protection, and ACS880 for heavy industrial duty with direct torque control. Size the drive on the motor's full-load current, not only its kW rating, and allow derating for the high ambient temperatures common in Gulf electrical rooms.

Where ABB products are used

In Oman and the GCC, ABB drives and motors run pumps, fans and compressors in water and wastewater plants, district cooling, oil and gas and industry. ABB flowmeters, level instruments and analysers are used in water utilities, power and desalination plants and refineries, and SACE breakers protect switchboards in buildings and plants.

ABB products we list

Family	Examples
AC drives	ACS580, ACS580-01-046A-4, ACQ580, ACS355, ACS310, ACS880-01, FEN-31 encoder module
Breakers, motor control and protection	SACE Tmax XT, XT3N 250, SACE Emax 2, AF09 contactor, PSR soft starter, REM615 relay
Flow measurement	ProcessMaster FEP300, AquaMaster4, CoriolisMaster FCB430, VortexMaster FSV430, SwirlMaster FSS430, OriMaster FPD500
Pressure, temperature and level	266DRH, 267CS multivariable, TTH300, K-TEK AT100, LMT200, MT5000 GWR, KM26 gauge
Analysers	Endura AZ20, AK100 hydrogen purity, Navigator AW641 silica, AW402 chlorine, AWT210
Control systems and actuators	AC500, AC500-S, S800 AI810, AC 800F SA 811F, Contrac RSD50, Contrac RHD4000

Ordering ABB products: what we need

Send the full type code from the nameplate (for example ACS580-01-046A-4 or 266DSH...) and, for spare parts, the ABB ID number (such as 3BSE008508R1 or 1SBL176001R3010). For drives, add the motor power and current and any option codes (+...). For instruments, send the complete order code, which sets range, materials and approvals. Baldor motors are listed on their own brand page.

Facts checked against ABB company filings and published histories of ASEA and Brown, Boveri & Cie, October 2026.