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Brand: ABB
ABB EF19-18.9 Electronic Overload Relay 5.7-18.9 A
Description
EF19-18.9: the top current range of the compact EF19 relay
EF19-18.9 is the highest of the five setting ranges of the EF19 electronic overload relay: 5.7 to 18.9 A. It mounts straight onto ABB AF09 to AF38 block contactors, and it takes power from the motor current itself, so no auxiliary supply is wired.
ABB positions electronic relays as the alternative to thermal overload relays. The selectable trip classes 10E, 20E and 30E let a single device cover normal and heavier starting loads, and temperature compensation holds the setting over -25 to +70 C.
Technical specifications
| Parameter | Specification |
|---|---|
| Type designation / order code | EF19-18.9 / 1SAX121001R1105 (EAN 4013614404023) |
| Device type | Self-supplied three-pole electronic overload relay, no external supply needed |
| Current setting range | 5.7…18.9 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 | 690 V AC; Ui 690 V; Uimp 6 kV; pollution degree 3; overvoltage category up to III |
| Short-circuit protective device | 50 A gG fuse (UL: 30 A K5/RK5 at 480 V; 20 A circuit breaker at 600 V) |
| Resistance / power loss per pole | 0.85 mOhm; 0.028 W at 5.7 A, 0.304 W at 18.9 A |
| Connection (main) | Rigid 1 x 1…4 mm2 or 2 x 1…4 mm2; flexible 0.75…2.5 mm2; stripping 9 mm; torque 0.8…1.5 Nm; Pozidriv 2 |
| Suitable contactors | AF09 … AF38 block contactors |
| Mounting | Directly on AF block contactors, or on 35 mm DIN rail with a single-mounting kit; any position 1-6 |
| Ambient temperature | Operation -25…+70 C (compensated); storage -50…+85 C; altitude up to 2000 m |
| Standards | IEC/EN 60947-1, 60947-4-1, 60947-5-1; UL 60947-1, 60947-4-1; LVD 2014/35/EU, EMC 2014/30/EU, RoHS 2011/65/EU |
| Auxiliary circuit | 600 V AC/DC; 6 A thermal; AC-15 3 A at 110-240 V, 1.1 A at 400 V; 6 A gG fuse |
| Operating frequency | Up to 15 operations/h, or 60/h at 40 % duty ratio (breaking current 6 x In, starting time up to 1 s) |
How the EF19 protects the motor
The relay has an ampere scale, so you set the motor rated current directly. In line with the standard, the setting is the motor current, not the trip current: ABB states no tripping at 1.05 x the setting and tripping at 1.2 x. Phase-loss sensitivity is included, and the trip contact 95-96 opens the contactor coil circuit.
Short-circuit protection is the installer’s job; ABB gives a 50 A gG fuse for this range. Power loss is only 0.304 W per pole at 18.9 A. At 15 operations per hour, or 60 per hour with 40 percent duty, you stay inside the no-early-trip limit, provided starting time does not exceed 1 s.
Choosing the range and the mounting method
The 18.9 A range suits motors of roughly 3 to 7.5 kW at 400 V. If the motor is lower, the EF19-6.3 (1.9 to 6.3 A) gives better resolution. Because the relay clips under the contactor, the DB19EF single-mounting kit is needed to put it on a DIN rail instead.
Wire the signalling contact 97-98 to the PLC for a trip indication and keep reset automatic or manual according to the plant rule.
Documents and quotation
The linked file is ABB EF19 and EF45 electronic overload relay data sheet 2CDC107025D0201. Seven Star LLC supplies the EF19-18.9 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 EF19 and EF45 electronic overload relay data sheet 2CDC107025D0201 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.
Related products
Frequently Asked Questions
What is the setting range of the EF19-18.9?
5.7 to 18.9 A, according to the ABB data sheet.
Which contactors does it mount on?
ABB AF09 to AF38 block contactors, directly; a DB19EF kit allows DIN-rail mounting.
Does it need an external supply?
No. It is self-supplied from the motor current through built-in current transformers.
Which trip classes are selectable?
10E, 20E and 30E.
What short-circuit protection does ABB list?
A 50 A gG fuse for the EF19-18.9.
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