I/O modules

The GE IS200SRLYH2A IS200SRLYH2AAA Simplex Relay Output Board provides discrete output switching for turbine control systems. This board operates in simplex (non-redundant) configurations only. You will find it managing solenoids, contactors, and indicator lamps. It works seamlessly within the GE Mark VI series.

Core Technical Specifications

The GE IS200SRLYH2A IS200SRLYH2AAA contains 24 sealed electromechanical relays on a single board. Each relay offers form-C (SPDT) contacts for flexible wiring options. The board accepts either 24 VDC, 125 VDC, or 115 VAC power inputs. Every relay handles a maximum continuous current of 5 amperes.

Connectors and Physical Layout

The GE IS200SRLYH2A IS200SRLYH2AAA uses two 64-pin DIN connectors for backplane communication. These connectors carry all relay coil drive signals from the VCRC controller. Additionally, the board provides screw-type terminal blocks for field output wiring. Each terminal accepts wire gauges from 18 AWG to 14 AWG. A clear silkscreen legend identifies every relay number and contact position.

Energy Storage and Protection Features

This relay board does not contain any electrolytic capacitors or batteries. Therefore, it stores virtually no residual energy after system shutdown. Each relay includes a built-in flyback diode for inductive load protection. This diode suppresses voltage spikes from solenoid coils. Moreover, the GE IS200SRLYH2A IS200SRLYH2AAA incorporates transient suppression devices on all inputs. You can hot-swap this board in a live cabinet without damage. Use it only for simplex applications, not for TMR safety systems.

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