ABB CR324FXLS Three-pole overload relay

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1. Product Overview

The ABB CR324FXLS Three‑Pole Overload Relay is a thermal overload protective device designed to protect three‑phase AC motors from overload and stall conditions. It is typically mounted in conjunction with a contactor in motor starter circuits and utilizes bimetallic thermal elements for reliable trip performance.

The relay can be reset manually or by remote/electrical reset if used with auxiliary control circuits and provides auxiliary contact outputs for alarm or interlock signaling.

2. Technical Specifications (Typical)

• Model: CR324FXLS

• Type: Three‑Pole Thermal Overload Relay

Rated Operating Current Range:
‑ 12 … 18 A (adjustable range, typical)

Poles: 3P (Three poles)

Trip Characteristics:
‑ Thermal delay trip
‑ Balanced three‑pole thermal elements

Mounting:
‑ Mounted with a contactor assembly or independent DIN rail/base mount (as needed)

Reset Options:
‑ Manual reset
‑ Remote/electrical reset via auxiliary control circuit

Auxiliary Contact Function:
‑ Normally Closed (NC) trip/alarm contact for remote signaling

Voltage Supply:
‑ Overload relay is thermally driven by the main circuit
‑ Auxiliary contact coils may be powered by 24 V DC / 110–240 V AC/DC depending on configuration

Operating Temperature:
‑ ‑25 °C to +60 °C (no derating)

Mechanical Life:
‑ ≥ 10,000 operations (typical)

Electrical Life:
‑ ≥ 4,000 operations (dependent on load)

Standards/Installation:
‑ DIN rail or integrated contactor mount

Protection Class:
‑ IP20 (standard industrial)

3. Advantages & Features

✔ Accurate overload protection using bimetallic thermal elements
✔ Adjustable current setting for flexible adaptation to motor rated current
✔ Flexible mounting with contactor or independently in control cabinets
✔ Manual and remote reset options for automation integration
✔ Auxiliary alarm contact for signaling to PLC or alarm systems
✔ Industrial reliability and longevity designed for continuous operation

4. Typical Applications

• Three‑phase AC motor overload protection
• Machine tools and automation equipment
• Pumps, fans, compressors, and HVAC motor protection
• Conveyor and material handling systems
• General industrial low‑voltage motor control systems

5. Installation & Operation Notes

• Match current setting to motor rated load but slightly above to avoid nuisance trips
• Ensure correct wiring: Main terminals should carry motor current through thermal elements; auxiliary contacts should be wired per control logic
• Secure mounting with contactor or proper DIN rail base for mechanical integrity
• Consider ambient temperature as high temperatures can accelerate trip timing
• Verify reset logic: Confirm motor fault condition is resolved before reset