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Application Scenarios:In a municipal water treatment plant, a critical cooling water pump driven by a 2.2 kW motor (FLC ~4 A) experiences frequent nuisance trips due to voltage sags and high ambient temperatures. The existing thermal overload relay cannot distinguish between permissible transient overloads and genuine faults, leading to unnecessary downtime. Replacing it with the 193‑EC2AD allows the maintenance team to set a precise Class 10 trip curve matched to the motor’s nameplate. The relay’s solid‑state sensing ignores harmless transients while its internal ground‑fault protection instantly isolates the motor if insulation failure occurs during a washdown, preventing winding burnout and costly repairs.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 193‑EC2AD |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Series | Bulletin 193‑EC (E3 Plus) |
| Device Type | Electronic Solid‑State Overload Relay |
| Rated Operational Current (Ie) | 1 – 5 A (Adjustable) |
| Ground Fault Protection | Internal Sensor, 1 – 5 A Adjustable |
| Trip Class | Class 10 (Standard) |
| Control Voltage | 24–240V AC/DC (via auxiliary power) |
| Digital Inputs | 4 Programmable Logic Inputs |
| Output Relays | 2 Programmable Output Relays (Fault, Aux) |
| Communication | Optional DeviceNet (via add‑on module) |
| Contactor Compatibility | Bulletin 100‑C (Sizes C30, C37, C43) |
| Mounting | Direct Plug‑On (DIN Rail also possible) |
| Status | Discontinued/Replaced by newer series |
Technical Principles and Innovative Values:
- Innovation Point 1: Solid‑State Accuracy Replaces Bimetallic Heater. Unlike traditional thermal overloads that rely on heater coils and bimetallic strips (which are sensitive to ambient temperature and require manual reset), the 193‑EC2AD uses microprocessor‑based current sensing. It calculates a precise thermal model of the motor, providing consistent trip times regardless of environmental temperature and eliminating the need for costly heater element selection. This ensures the motor is protected based on its actual thermal capacity, not just current magnitude.
- Innovation Point 2: Integrated Ground‑Fault Protection. A significant upgrade over basic overload relays, the 193‑EC2AD incorporates an internal ground‑fault current sensor. This eliminates the need for an external zero‑sequence current transformer (CT) in many applications, providing fast detection of phase‑to‑ground faults (adjustable 1–5 A) within the same compact unit. This integrated design saves panel space, reduces wiring, and enhances personnel safety.
- Innovation Point 3: Programmable Logic & Diagnostics. The relay features 4 digital inputs and 2 programmable outputs, allowing it to function as a simple motor controller. Logic functions (e.g., start/stop interlocks, reset commands) can be programmed directly into the relay, reducing the load on the PLC. Additionally, it provides diagnostic information such as pre‑trip warnings and phase imbalance alerts, enabling predictive maintenance before a catastrophic failure occurs.
