IC3600KRSE1 - 8-Channel Reed Relay Selector Board

SPECIFICATIONS:

Part Number: IC3600KRSE1
Manufacturer: General Electric (GE)
Series: Speedtronic Mark I & II
Product Type: Relay Selector Circuit Board
Input Voltage: 28 VDC (Nominal)
Logic Type: Discrete Relay-Based Switching
Components: Electromechanical Relays, Diodes, Resistors, Transistors
Mounting: Edge-connector plug-in interface
Operating Temperature: 0 to 60 °C (32 to 140 °F)
Response Time: <15 ms (Relay Actuation)
Isolation: Contact-to-Coil Galvanic Isolation
Repair: 3–7 Days
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

IC3600KRSE1 is an 8-Channel Reed Relay Selector Board manufactured and designed by General Electric as part of the Mark II Series used in GE Speedtronic Control Systems. An 8-Channel Reed Relay Selector Board is a circuit board that allows you to control the speed of up to eight devices using a low-voltage signal. This board functions as a high-reliability switching interface, responsible for selecting and routing specific control signals to various turbine subsystems. It acts as a bridge between low-level logic signals and higher-current field devices, such as solenoid valves, motor starters, or alarm annunciators. By utilizing electromechanical relays, the board provides physical isolation between control circuits, ensuring that faults in one subsystem do not propagate to the sensitive master controller logic.

Relay boards for controlling DC motor speed: These boards are typically used with DC motors and allow you to control the speed of the motor by varying the pulse-width modulation (PWM) signal to the motor. A PWM signal is a digital signal that varies between on and off, and the ratio of the on-time to the total time of the signal cycle determines the average voltage applied to the motor.

Relay boards for controlling AC motor speed: These boards are typically used with AC motors and allow you to control the speed of the motor by turning the motor on and off rapidly. The speed of the motor is controlled by varying the on-off ratio. These boards are not as common as DC motor speed control boards because there are more efficient ways to control the speed of AC motors. When choosing an 8-channel speed relay board, you will need to consider the following factors:

• The type of motor you are controlling (DC or AC)
• The voltage and current rating of the motor
• The number of channels you need
• The type of control signal that the board accepts (analog or digital)

SIGNAL ROUTING & LOGIC EXECUTION

The board contains multiple onboard relays that switch states in response to 28 VDC logic commands. These relays are often configured in series or parallel strings to perform Boolean operations (AND/OR logic) at the hardware level. This hardware-based logic approach ensures a deterministic response that is immune to software crashes, providing a critical layer of safety for turbine protection and sequencing.

World of Controls is a specialist in legacy turbine control parts, providing high-quality solutions for systems that have been superseded by modern digital platforms. We offer the IC3600KRSE1 in both unused surplus and professionally rebuilt conditions. Our refurbishment process is exhaustive: we replace all aging semiconductors, test every relay for contact resistance, and perform full functional validation on specialized GE test benches. With a 3–7 day repair turnaround, worldwide shipping, and 24/7 technical support, we ensure your legacy GE assets remain reliable and operational.

FREQUENTLY ASKED QUESTIONS:

What is the GE IC3600KRSE1?

The IC3600KRSE1 is a relay selector board used in GE Mark I and Mark II control racks. It serves as a hardware-based logic and switching card that routes control signals to field devices like solenoids and alarms based on inputs from the turbine's control logic.

What are the common failure modes for this relay board?

Common failure points include contact pitting or carbon buildup on the relays (leading to high contact resistance) and the aging of discrete transistors used to drive the relay coils. Over time, the solder joints on the heavy relay pins can also suffer from thermal fatigue, which WOC rectifies during our rebuilding process.

How is the logic timing affected by the electromechanical design?

Because it uses physical relays, the response time is typically in the 10–15 millisecond range. While slower than solid-state switching, this speed is perfectly suited for the mechanical response times of the valves and motors it controls, while providing superior electrical isolation and robustness.