E1 Plus Electronic Overload Relays
Specification Guide
1.0 General
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
1.09
1.10
1.11
1.12
1.13
The electronic overload relay shall be self-powered with no external power connections to
ensure overload protection.
The electronic overload relay shall provide current measurement-based protection.
Motor current shall be monitored through three integral current transformers that power the
overload protection circuitry.
The electronic overload relay shall operate on 150mW or less of power.
The electronic overload relay shall be available in single- and three-phase versions.
The electronic overload relay shall be available for a current range of 0.1 to 90 amperes.
The electronic overload relay shall be capable of direct connection and mounting to contactors
in low voltage applications.
The electronic overload relay shall provide 1 N.O. and 1 N.C. isolated auxiliary contacts.
All relay contacts shall be rated AC15 / B600.
A trip indicator flag shall be provided at the overload relay face for visual trip status
indication.
A reset button shall be provided at the overload relay face for the purpose of trip resetting.
A test button shall be provided at the overload relay face. The test button shall momentarily
actuate only the N.C. contact.
A mechanical trip cam shall be provided at the overload relay face for the purpose of
mechanically operating both sets of contacts.
2.0 Construction
2.01
2.02
2.03
2.04
2.05
2.06
2.07
2.08
2.09
2.10
2.11
2.12
The electronic overload relay shall be available in both IEC and NEMA configurations.
The dimensions of the electronic overload relay shall not exceed 45mm width for current
ratings through 45 amperes and 72mm for current ratings through 90 amperes.
The electronic overload relay base shall be flush with the contactor base when assembled as a
two component starter.
The electronic overload relay power connections for starter mounting shall consist of a one
piece over-molded assembly; separate wires per phase shall not be accepted.
The electronic overload relay shall be capable of being separate mounted through a DIN
rail/panel mount adapter accessory.
Wiring terminals shall provide IP20 finger protection.
Screw type control terminals shall be provided with an option for cage clamp type on IEC
devices.
The electronic overload relay shall have an integral latching mechanism that interlocks to the
base of IEC contactors through 45 amperes.
Terminal markings shall comply with CENELEC and EN 50012.
The electronic overload relay and accessories shall be rated for an operating environment of
-20°C to +60 C (-4 to +140 F).
The electronic overload relay shall be capable of operating in an environment with a relative
humidity range of 0 to 95%, non-condensing.
The electronic overload relay shall be able to withstand a shock of 30G (per IEC 68-2-27).
Publication 193-TD008A-EN-P, November 2003
E1 Plus Electronic Overload Relays
2.13
2.14
2.15
The electronic overload relay shall be able to operate without disruption for vibration levels up
to 3G (per IEC 68-2-6).
The electronic overload relay shall be able to operate without de-rating to an elevation of
2000m.
The electronic overload relay shall be rated for application in Pollution Degree 3
environments.
3.0 Protection Functions
The electronic overload relay shall incorporate the following protection function capabilities:
3.01 Thermal Overload
The thermal overload algorithm shall employ a time-current integration model based on the
composite average phase current as compared to the threshold setting.
The electronic overload relay shall provide ambient temperature compensated thermal
protection.
The electronic overload relay shall offer a FLA setting range of 5:1 or greater.
FLA setting marks shall be evenly spaced around the adjustment dial.
The electronic overload relay shall provide class 10 fixed thermal overload protection with
an option for DIP switch selectable trip classes (10, 15, 20, or 30).
The electronic overload relay shall incorporate a thermal memory circuit to ensure accurate
protection for both hot and cold motors.
The electronic overload relay shall provide manual-only trip resetting capability with an
option for DIP switch selectable reset mode (manual / automatic-manual).
The electronic overload relay shall provide trip-free operation.
A current adjustment shield accessory shall be offered that provides protection from
inadvertent adjustment of the FLA setting when installed.
3.02 Phase Loss
The electronic overload relay shall incorporate a phase loss detection circuit for responsive
phase loss tripping performance.
The typical reaction time for phase loss tripping shall be 3 seconds.
4.0 Standards
The electronic overload relay shall be designed for compliance to the following standards:
4.01
4.02
4.03
4.04
EN 60947-4-1
EN 60947-5-1
UL508
CSA C22.2 No. 14
5.0 Manufacturers
Approved manufacturers for electronic overload relays include:
5.01 Allen-Bradley E1 Plus Electronic Overload Relay
Publication 193-TD008A-EN-P, November 2003