Allen-Bradley 193-EC1AB E3 1-5 A Overload Relay

E3 electronic overload relay for motors from 1 to 5 A

The Allen-Bradley 193-EC1AB is an E3 electronic overload relay with a full-load current range of 1 to 5 A. It measures true RMS current in each phase, offers an adjustable trip class from 5 to 30 and communicates over DeviceNet. Rockwell’s description calls it the E3 1-5 A overload relay.

In the 193-TD012 comparison table the 193-EC1 is the basic E3: two inputs, one relay output and no internal ground-fault sensor. The E3 Plus versions (EC2 and higher) add inputs, a second output and additional protective functions.

The catalog number starts with 193 for the bulletin and EC1 for the basic E3 platform; the current range (1 to 5 A) is taken from the Rockwell product page, and the remaining option letters should be confirmed against the catalog before ordering.

Protection functions in the E3

The relay provides overload protection through true RMS current measurement, with a thermal memory circuit and a configurable trip class between 5 and 30. A warning bit can alert the controller of an impending trip, and the estimated time to trip is reported over the network.

Phase loss protection can be enabled or disabled, with an adjustable delay, and the E3 also provides jam (overcurrent), stall and underload (pump cavitation) detection with trip and warning levels. These functions are useful for pumps, conveyors and fans where a mechanical problem should be caught before the thermal element trips.

Technical specifications

Network data and wiring

The relay is a DeviceNet slave device and reports phase currents, percent thermal capacity utilization, trip history and diagnostic data such as the number of starts. The two 24V DC sinking inputs can monitor contactor auxiliaries, pilot devices or limit switches, and their status is mapped into the controller input image.

The single relay output can be assigned to trip, control or network commands. Rated operating voltage is 600V (NEMA) or 690V / 1000V (IEC), and the product is listed to UL 508 and carries CE, CCC and other marks listed in the datasheet; the product page records certifications as of 2026-07-16.

Ordering and documents

Order 193-EC1AB in full; the DeviceNet cable, the contactor, current-sensing accessories and communications gateways are separate items. The reference document is the E3 and E3 Plus specification 193-TD012A, and the user manual is 193-UM002.

Seven Star LLC is an independent supplier in Muscat and quotes on request; please confirm every rating against the current Rockwell documents before ordering.

Browse more items in Contactors & Overload Relays on our site, or send us the part number for a quotation.

How the 193-EC1AB Works

The 193-EC1AB measures the current in each of the three motor phases with built-in current transformers and calculates the true RMS value. From these currents it runs an electronic thermal model of the motor, the thermal capacity utilisation, which rises as the motor runs above its full-load current and falls as it cools. When the model reaches 100%, the relay trips and opens its output, which is wired into the contactor coil circuit.

The trip class sets how quickly this happens. Under the usual NEMA/UL convention, a class 10 relay trips within 10 seconds at 600% of the full-load current setting, a class 20 within 20 seconds, and so on. A low trip class suits motors that must be protected quickly, such as submersible pumps, while a high trip class lets high-inertia loads such as fans start without nuisance trips. Because the setting is electronic and adjustable from 5 to 30, one relay can cover many different motors within its 1–5 A range.

Selection & Ordering Guide for the 193-EC1AB

• 193-EC1 – basic E3: overload, phase loss, jam, stall and underload, 2 inputs and 1 output.
• 193-EC2 / EC3 – E3 Plus: adds inputs and outputs, ground-fault sensing on the lower ratings and a PTC thermistor input.
• Select the current range so the motor full-load current sits inside it; for the 193-EC1AB this is 1 to 5 A.

The E3 family has been discontinued by Rockwell Automation, and the E300 electronic overload relay is the current platform for new designs. For replacement of an existing E3 in a running system, an identical catalog number keeps the wiring, mounting and DeviceNet configuration unchanged; for new projects, ask about a suitable E300 configuration. Our team can help confirm the correct ordering code when you request a quote.

Installation & Maintenance

• Mount the relay directly to the matching contactor or on its panel-mount adapter, following the Rockwell user manual.
• Set the full-load current from the motor nameplate, and choose the trip class that suits the motor and the driven load.
• Configure the DeviceNet node address and baud rate before connecting to the network, and keep the configuration file with the panel documents.
• Keep DeviceNet trunk and drop lengths within the network limits, and terminate the trunk correctly at both ends.
• After a trip, use the trip history to find the cause before resetting, rather than simply raising the setting.

Typical Applications in Oman & the GCC

The 193-EC1AB protects small motors in motor control centres and machine panels: dosing and chemical pumps, small conveyors, fans and blowers, and auxiliary drives on packaging lines. Its jam and underload functions are useful on pumps in water networks, where a dry-running or blocked pump can be detected before damage occurs, and its network data helps maintenance teams in remote plants see the motor current without opening the panel.

Why Source from Seven Star LLC

Seven Star LLC supplies Allen-Bradley motor control components, including legacy items for existing installations, across Oman and the GCC. Send the 193-EC1AB catalog number and the motor data and request a quote; our team can help confirm the correct ordering code or a suitable alternative.