Description
ABB IMASI23 – Industrial Motor Protection & Monitoring Relay
The ABB IMASI23 is a compact yet robust motor protection relay designed for reliable monitoring and safeguarding of three-phase motors in industrial environments. From my experience, it’s typically found in pump systems, conveyor lines, and HVAC setups where motor failure could lead to costly downtime. One thing I appreciate is how it combines thermal overload protection with phase imbalance and phase loss detection—all in a DIN-rail mountable unit that fits neatly into standard control cabinets.
Key Features
- Thermal Overload Protection: Simulates motor heating curves to prevent damage from prolonged overcurrent—especially useful in applications with frequent starts or variable loads.
- Phase Failure & Imbalance Detection: Reacts within milliseconds if one phase drops or current becomes uneven, which seems to be critical in older plant installations where power quality isn’t always stable.
- DIN-Rail Mounting (35 mm): Saves space and simplifies panel integration. In many cases, technicians can replace older relays without modifying the enclosure.
- LED Status Indicators: Clear visual feedback on fault conditions—helpful during troubleshooting without needing extra tools.
- Adjustable Current Setting Range: Typically set between 0.4 A and 2.3 A, making it suitable for small to mid-sized motors commonly used in automation cells.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand / Model | ABB / IMASI23 |
| HS Code | 85371090 |
| Power Requirements | AC 230 V ±15%, 50/60 Hz |
| Current Setting Range | 0.4 – 2.3 A (adjustable via dial) |
| Operating Temperature | -25°C to +55°C |
| Signal Inputs | 3-phase current via motor line (no external CTs required) |
| Output Type | 1 x Changeover Relay (CO), 5 A resistive |
| Communication Interface | None (standalone device) |
| Installation Method | Top-hat DIN rail (35 mm) |
| Dimensions (W×H×D) | 45 × 80 × 60 mm |
| Weight | Approx. 180 g |
Application Fields
You might notice that the IMASI23 shows up most often in water treatment plants, packaging machinery, and building management systems. It’s particularly well-suited for retrofitting legacy motor starters where full digital control isn’t justified. Some customers have told me they use it as a cost-effective alternative to full PLC-based motor monitoring when only basic protection is needed.
Advantages & Value
Procurement teams tend to favor this model because it strikes a balance between simplicity and reliability. There’s no software setup or programming—just plug in and adjust the dial. That also means less training for maintenance staff. While it doesn’t offer remote diagnostics, its mechanical-electronic design has proven durable across harsh environments. From my experience, facilities with high motor counts appreciate the reduced spare parts complexity when using standardized relays like this.
Installation & Maintenance
Install in a standard IP54-rated control cabinet with adequate ventilation—especially important since the relay itself doesn’t have forced cooling. Make sure wiring uses at least 1.5 mm² stranded copper conductors with proper ferrules. Avoid routing power and control cables in the same duct to minimize interference. Routine checks should include verifying trip function every six months and cleaning dust buildup, which in some dusty workshops can affect heat dissipation. Firmware updates aren’t applicable here—it’s an analog-digital hybrid unit—but periodic functional testing is still recommended.
Quality & Certifications
The IMASI23 carries CE, UL, and RoHS certifications, meeting both EU and North American safety standards. It’s manufactured under ISO 9001-controlled processes, which gives us confidence in consistency across batches. We back every unit with a 365-day warranty against defects in materials and workmanship.
Our Order Placement Process & Guarantees
- Warranty: 365 days from date of delivery
- Delivery Time: 1 week for in-stock units; maximum 4 weeks if shipped from regional warehouse
- Payment Terms: 50% advance payment, remaining 50% before shipment
- Shipping Methods: FedEx, UPS, or DHL (account holder or prepaid options available)
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