GE IS200WROBH1A IS200WROBH1AAA | Relay Power Sensing

Core Function and System Role

The GE IS200WROBH1A senses and switches high-power relay circuits for Mark VI systems. Specifically, this board monitors contact status and controls power relays. Moreover, it provides electrical isolation between control logic and power circuits. The IS200WROBH1AAA variant includes enhanced arc suppression for inductive loads.

Technical Specifications Overview

This relay power sensing board features eight independent relay channels. Each channel switches up to 250 Vac or 30 Vdc. Furthermore, the board includes contact status sensing for each relay.

Parameter	Specification
Part Number	IS200WROBH1A / IS200WROBH1AAA
Type	Relay Power Sensing Board / Power Relay Module
Relay Channels	8 Channels
Contact Form	1 Form A (SPST-NO)
Switching Voltage	250 Vac / 30 Vdc Maximum
Contact Current	5 A (Resistive)
Coil Voltage	24 Vdc
Status Sensing	Built-in Contact Feedback
Arc Suppression	MOV (Standard) / RC Snubber (AAA)
Response Time	<10 ms
Status Indicators	8 Green LEDs
Power Supply	24 Vdc ±15%
Connector Types	2 x 50-pin D-sub, 2 x Terminal Blocks
Dimensions (W x H x D)	190 x 115 x 30 mm
Weight	0.68 kg
Onboard Energy Storage	4 x 100 µF, 35V Capacitors

Connector Layout and Component Count

The board uses two terminal blocks for power wiring connections. For instance, block TB1 handles relay outputs 1 through 4. Meanwhile, block TB2 manages relay outputs 5 through 8. Two 50-pin D-sub connectors interface with the main controller. The IS200WROBH1AAA adds eight RC snubber circuits for inductive load protection.

Energy Storage and Signal Integrity

This relay board includes local capacitance for stable coil operation. Specifically, four 100 µF capacitors filter the 24 Vdc supply. Therefore, the board maintains reliable relay actuation during power sags. Additionally, onboard LED indicators show each relay’s real-time status. For example, a green LED illuminates when the relay coil energizes. An off LED indicates a de-energized relay.

Diagnostic Features and Fault Detection

The board continuously monitors each relay contact for proper closure. Consequently, it detects welded or stuck contacts within 10 milliseconds. Moreover, the GE IS200WROBH1A IS200WROBH1AAA includes coil continuity verification for each channel. This feature confirms that relay coils remain intact. An onboard status register reports all channel health to the main controller.

Maintenance and Hot Replacement

You can replace this relay board without powering down the turbine. Thus, mean time to repair remains under ten minutes. The board stores no configuration data locally. Therefore, you simply install the replacement and resume normal power switching.

Industrial Applications

This relay power sensing board works inside GE Mark VI control cabinets. For reliable GE power relay control, the IS200WROBH1A and IS200WROBH1AAA deliver exceptional performance. They provide robust switching for steam and gas turbine auxiliary power circuits.