
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 |
