Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 269PLUS-D/O-278-100P-HI |
| Manufacturer | GE Multilin (now GE Vernova) |
| Product Series | 269 Plus Motor Management Relay |
| Product Type | Microprocessor-based Motor Management Relay |
| Chassis Type | D/O (Drawout / Plug-in) for hot-swappable maintenance |
| Control Power | 278 V AC ±10% |
| Power Consumption | Max 20 VA |
| Current Input | 3-phase CT (1:1 ratio) + Ground CT (2000:1 ratio) |
| RTD Input | Up to 12 channels of 100Ω Pt100 sensors |
| Communication | RS-485 port supporting Modbus RTU protocol |
| Output Relays | 4 Form C (SPDT): Trip (latched, fail-safe), Alarm (NFS, N.C.), Aux1 (NFS, N.O.), Aux2 (FS, N.O.) |
| Digital Inputs | Dry contacts only (Spare, Differential, Access, Ext Reset, Emergency Restart, Speed) |
| Mounting | 19″ rack drawer-style with rail guide, supports hot-swap |
| Dimensions (W×H×D) | Approx. 200 × 115 × 57 mm |
| Weight | Approx. 0.9 kg |
| Operating Temperature | -20 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Protection Class | IP20 |
| Lifecycle Status | Discontinued (replacement: Multilin 859) |
| Certifications | cULus, CE, RCM, China CCC |
Main Features and Advantages
Dual-Source Thermal Modeling for Accurate Motor Protection
The GE Multilin 269PLUS-D/O-278-100P-HI employs a unique thermal modeling algorithm that combines I²t current-based calculations with direct RTD temperature feedback . Unlike conventional overload relays that estimate temperature solely from current, this relay cross-verifies the computed thermal capacity against actual stator winding temperatures measured by Pt100 sensors . The 269PLUS-D/O-278-100P-HI updates the thermal capacity used to the higher of the two values, accounting for both electrical overload and external heating from poor ventilation or high ambient temperatures . This dual-source approach ensures maximum motor utilization while providing complete thermal protection.
Self-Learning Capability and MotorMatch Technology
A standout feature of the GE Multilin 269PLUS-D/O-278-100P-HI is its ability to “learn” individual motor parameters, adapting protection to each specific application . The relay continuously learns values for motor inrush current, negative sequence current K factor, cool-down rates, and acceleration time . The MotorMatch technology modifies protection settings based on these learned parameters, ensuring optimum protection for motors with varying characteristics, such as induced fan drives where stator and rotor thermal capacities differ significantly .
Flexible Overload Protection with FlexCurve™
The 269PLUS-D/O-278-100P-HI offers eight standard overload curves plus the FlexCurve™ function, allowing users to program custom curves when standard options do not suit the application . This flexibility enables the relay to protect motors that have different rotor and stator damage characteristics, allowing full utilization of motor design capacity .
Exponential Cooldown and Start Inhibit
The relay features true exponential cooldown characteristics that mimic actual motor cooling rates, allowing motors to be load cycled more frequently . The Start Inhibit feature automatically adjusts lock-out time based on available thermal capacity, preventing starts when insufficient thermal headroom exists . The GE Multilin 269PLUS-D/O-278-100P-HI also includes an Emergency Restart feature that can override start inhibit or overload trip conditions for critical production or safety situations .
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