Description
ABB SA9923A-E Motor Protection Relay – Reliable Overload & Fault Protection for Industrial Motors
If you’re managing motor control systems in demanding environments—like pumping stations, conveyor lines, or HVAC setups—the ABB SA9923A-E is one of those components that tends to fly under the radar until you actually need it. Then, suddenly, its role becomes critical. From my experience, this thermal overload relay isn’t flashy, but it’s solid. It’s designed to protect three-phase motors from overheating due to overloads, phase loss, or prolonged start times, which in many cases prevents costly downtime and winding damage.
Key Features
- Thermal Overload Protection: Simulates motor heating based on load current, offering realistic tripping behavior that matches actual motor thermal characteristics.
- Phase Loss & Imbalance Detection: One thing I appreciate is how it responds reliably to phase failure or significant imbalance—common issues in older plant power distribution systems.
- Adjustable Current Setting Range: Typically covers 0.55–2.5 A, making it suitable for small to mid-sized motors without requiring external CTs in most cases.
- Mechanical Ratchet Trip Indication: Once tripped, the indicator stays visible even after power-down, helping maintenance crews quickly identify fault history.
- Manual or Automatic Reset Option: Offers flexibility depending on your safety protocols—some plants prefer manual reset to force operator awareness post-trip.
- Compact Design: Fits standard DIN rail mounting and integrates easily with ABB contactors like the S2xx series, reducing cabinet space requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand / Model | ABB / SA9923A-E |
| HS Code | 85371090 (Control panels and protection relays for electrical circuits) |
| Rated Control Voltage | AC 230 V ±15%, 50/60 Hz |
| Current Setting Range | 0.55 – 2.5 A |
| Operating Temperature | -25°C to +55°C (storage up to +70°C) |
| Installation Method | Top-hat DIN rail (35 mm) or panel mount using adapter |
| Dimensions (W×H×D) | 45 × 80 × 65 mm approx. |
| Weight | Approx. 220 g |
| Communication Interface | None (electromechanical relay); auxiliary contacts only (1NO+1NC standard) |
Application Fields
The SA9923A-E shows up a lot in wastewater treatment plants where submersible pumps run for long periods under variable loads. It also appears in packaging machinery and light manufacturing lines where motor reliability is key but full digital monitoring isn’t justified. In many cases, engineers choose this model when they want something durable, easy to replace, and compatible with legacy ABB starter combinations. You might notice it paired with an S203 contactor and a disconnector in compact MCC cells.
Advantages & Value
While newer digital protectors offer communication and data logging, the SA9923A-E still holds value in cost-sensitive or high-reliability applications. Its purely electromechanical operation means fewer points of failure—no firmware crashes or configuration errors. Procurement teams typically appreciate the availability and consistent pricing across regions. Spare units can be kept on-site without worrying about shelf life or software compatibility. And because it’s been around for years, most electricians already know how to set and test it.
Installation & Maintenance
Mounting is straightforward—just snap it onto a 35 mm DIN rail next to its matching contactor. Make sure there’s at least 10 mm clearance above and below for airflow, especially if installed in enclosed cabinets without forced ventilation. Wiring should use stranded conductors with ferrules, sized for 1.5 mm² max. The input connects directly to the motor’s load side via the contactor output terminals. Avoid sharing control voltage with high-noise devices like VFDs unless filtered.
For maintenance, inspect annually for dust buildup and verify trip function by simulating overload (using test button or controlled current injection). Clean with dry compressed air—don’t use solvents. There’s no calibration needed, but check mechanical linkage movement if the unit has tripped multiple times. Firmware updates aren’t applicable here, which in some ways simplifies lifecycle management.
Quality & Certifications
The SA9923A-E carries CE, UL Listed (through system certification with ABB starters), and complies with IEC 60947-4-1 standards. It’s RoHS compliant and built in ISO 9001-certified facilities. The typical warranty offered is 365 days from date of shipment, covering defects in materials and workmanship. Units are tested prior to dispatch, and batch traceability is maintained.
Our Order Placement Process & Guarantees
- Warranty: 365 days from shipment date
- Delivery Time: 1 week for in-stock items; no more than one month at latest for backorders
- Payment Terms: 50% advance payment, remaining 50% before delivery
- Shipping Methods: FedEx, UPS, or DHL express (door-to-door tracking provided)
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