Allen-Bradley 193-EC2DD E3 Plus Solid-State Overload Relay, 9–45 A Motor Protection

Allen-Bradley 193-EC2DD E3 Plus Solid-State Overload Relay, 9–45 A Motor Protection

Description:

The Allen-Bradley 193-EC2DD​ is an E3 Plus electronic (solid-state) overload relay from Rockwell Automation’s Bulletin 193 family, covering a full-load current range of 9 to 45 A. It is a microprocessor-based motor protection relay that replaces the traditional bimetallic thermal overload, and it mounts directly onto Bulletin 100-C30 through 100-C43 contactors.

Where a conventional overload relay is a passive trip device, 193-EC2DD​ is an active protection and data node. It measures true RMS current, runs a thermal model of the motor with memory retained through power loss, detects phase loss, current imbalance, stall, jam and underload, senses low-level ground fault through an internal sensor in the 1–5 A band, and accepts a PTC thermistor for direct winding-temperature monitoring. With four 24 V DC inputs, two outputs, DeviceLogix Series B local logic and a DeviceNet slave interface, the 193-EC2DD​ also reports what it knows back to the control system instead of keeping it to itself.

Allen-Bradley 193-EC2DD E3 Plus Solid-State Overload Relay, 9–45 A Motor Protection

 

Application Scenarios:

A wastewater treatment plant runs a dozen 15 kW submersible pumps on a DeviceNet motor control centre. One Tuesday, pump four trips on overload. The operator walks to the MCC, sees a single LED, presses reset, and the pump runs again — until it trips two hours later. Nobody knows why. Is the impeller ragging up? Is a phase dropping under load? Is the motor simply hot because the wet well is at peak inflow? With a bimetallic relay, that question is answered by swapping parts and hoping.

With the 193-EC2DD​ in that same bucket, the answer is already on the network before anyone walks anywhere. The relay reports the trip type — overload, jam, underload, phase imbalance or ground fault — along with the thermal capacity used at the moment of the trip, the current on each phase, and the trip history. The maintenance team sees “jam” at 138% FLA with phase currents balanced, and sends someone to clear the impeller instead of ordering a motor. The pain points 193-EC2DD​ removes are essentially the pain of guessing: unexplained trips, unnecessary motor replacements, bearings destroyed by single-phasing that a thermal relay responded to too slowly, insulation breakdown preceded by leakage current that nothing was monitoring, and — most expensive of all — the walk-to-the-MCC-and-press-reset cycle repeated across dozens of starters because no diagnostic information leaves the cabinet.

The same value lands in a food and beverage plant where a jammed conveyor must be identified in seconds rather than after a shift, in a chemical facility where ground-fault leakage on a corroded cable is an early warning rather than a shutdown, and in any process where a motor is important enough that its failure is an event rather than an inconvenience. The 193-EC2DD​ turns each motor starter from a dumb switch into an instrumented asset.

 

Parameter:

Values below reflect Rockwell Automation’s published product data for catalog number 193-EC2DD​ and the E3 Plus series user manual.

Main Parameters Value / Description
Product Model 193-EC2DD​
Manufacturer Allen-Bradley / Rockwell Automation
Product Category E3 Plus solid-state (electronic) motor protection overload relay, Bulletin 193
Full Load Current Range 9–45 A adjustable — a 5:1 adjustment ratio, so one relay covers a wide band of motor sizes and reduces spare inventory
Trip Class Adjustable 5 to 30 — matches the relay’s trip curve to the motor’s actual acceleration duty, from fast-tripping to long-start high-inertia loads
Voltage Rating 600 V AC (NEMA) / 690 V AC (IEC)
Sensing True RMS current sensing, 20–250 Hz — accurate on distorted waveforms from drives and soft starters
Protection Functions Thermal overload with thermal memory, phase loss, current imbalance, stall (during start), jam (during run), underload, low-level ground fault, PTC thermistor over-temperature
Ground Fault Sensing Internal sensor, 1–5 A detection range — no external current transformer required
Digital I/O 4 sinking inputs at 24 V DC; 2 Form C relay outputs — inputs configurable for trip reset, remote trip, two-speed and general-purpose use
Communication DeviceNet, slave only, ODVA compliant — the relay is a node on the network, not just a device hanging off it
Local Logic DeviceLogix Series B — executes control functions locally using the on-board I/O without a PLC round-trip
Control Power 24 V DC, typically supplied from the DeviceNet network, operating range 11–25 V DC
Power Consumption 3.9 W rated; 4.53 W maximum dissipation
Mounting Direct contactor mount to Bulletin 100-C30, 100-C37 and 100-C43 contactors — no separate panel footprint
Reset Mode Manual or automatic, field configurable
Phase Configuration Single-phase or three-phase selectable via parameter 27, both with straight-through cabling
Operating Temperature −20 °C to +55 °C; storage −40 °C to +85 °C
Shock and Vibration 30 G operating shock, 3 G operating vibration — rated for MCC and machine-mounted service
Protection Rating IP1X
Certifications UL 508, CSA, CE, China CCC
Weight Approximately 0.8 kg
Lifecycle Status Discontinued by Rockwell Automation as of 31 October 2019; not repairable; direct replacement is 193-ESM-IG-60A-C55

Allen-Bradley 193-EC2DD E3 Plus Solid-State Overload Relay, 9–45 A Motor Protection1

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