Description
Selco T3200-01 Insulation Monitor
Marine Dual-Output Insulation Resistance Monitoring Relay
This genuine Selco T3200-01 monitor is in excellent used condition. It has been clean-inspected, and bench-tested for accurate dial calibration, LED signal status indicators, and contact-switching operations. The terminal barrier strip screws are fully intact with no stripped threads or corrosion.
Product Overview
The Selco T3200-01 is a high-precision Insulation Monitoring Relay designed specifically to track and protect ungrounded AC networks in marine and offshore applications. By continuously measuring the insulation resistance between the phase lines and the vessel’s hull or earth ground, it offers critical, proactive warning of electrical decay.
Featuring independent dial settings for both warning alerts (Sys. 1) and full trip alarms (Sys. 2), the T3200-01 allows engineers to isolate leaking circuits before a complete phase-to-ground short circuit or electrical fire can develop. Its specialized circuitry maintains high fidelity even when managing systems with significant DC harmonic leakage from rectifiers or variable-frequency motor drives.
Technical Specifications
| Specification Parameter | Details |
|---|---|
| Brand / Manufacturer | Selco (Denmark) |
| Model Number | T3200-01 (T3200 Series) |
| Device Type | Insulation Monitoring Relay (Ground Fault Monitor) |
| Monitoring Ranges | Adjustable Megohms dials per channel (0.05 to 5 Megohms) |
| Time Delay Settings | Adjustable trip delay (0 to 10 Seconds) per output relay |
| Output Channels | Dual Output Contacts (System 1 Warning / System 2 Shut-off) |
| Mounting Profile | Standard 35mm DIN-rail or direct bulkhead screw mount |
Key Features
- Dual Threshold Security: Allows independent warning setpoints to handle low-level alerts before activating emergency breaker trips.
- Robust Vibration Isolation: Designed explicitly to operate in environments exposed to continuous mechanical vibration, such as main engine compartments.
- Integrated Signal Damping: Effectively manages transient DC leakage currents generated by modern shipboard inverters and rectifiers.
- Simple Control Faceplate: Analog configuration dials and bright diagnostics status LEDs (Power Green / Relay Trip Red) make in-field testing and parameter adjustments straightforward.

