The EF205 and EF370 are self-supplied electronic overload relays for motor protection against overload and phase failure, requiring no external power. They offer selectable trip classes (10E, 20E, 30E), temperature compensation, and manual or automatic reset. The EF205 supports 63-210 A with 100 kA short-circuit rating using 400 A, Class J fuses at 600 V AC. The EF370 supports 115-380 A with 100 kA rating using 600 A, Class J fuses at 600 V AC or 18 kA with 800 A, Class L/T fuses at 480 V AC. Both mount directly to contactors, meet UL 508, CSA 22.2 No. 14, and IEC 60947-4-1 standards, operate from -25 to +70 °C, and have IP20 protection. Main circuit connections accommodate rigid or flexible conductors up to 185 mm² (EF205) or 240 mm² (EF370). Auxiliary contacts are rated at 5 A thermal current for UL/CSA and 6 A for IEC.
Description
The EF205 and EF370 are 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.
| ABB Inc. | |
|---|---|
| Product Category | Protective Relays and Monitoring Relays |
| Product Number | EF205, EF370 |
| Product Name | Electronic Overload Relays |
| Voltage Sensitive Relay | Overvoltage Protection |
| Power (Phase) Sensing | Phase Failure (Loss) |
| Features | Automatic Reset; Visual Indicator |
