IS210TREGH2B - Gas Turbine Emergency Trip Terminal Board

IS210TREGH2B - Gas Turbine Emergency Trip Terminal Board IS210TREGH2B - Gas Turbine Emergency Trip Terminal Board

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Part Number: IS210TREGH2B
Manufacturer: General Electric
Series: Mark VI
Product Type: Gas Turbine Emergency Trip Terminal Board
Number of trip solenoids: 3
Trip solenoid rating: H1 / S1- 125 V dc
Solenoid inductance: 0.1 sec
Suppression: MOV
Relay outputs: 3
Trip interlock filter: 4 ms
Trip interlock ac voltage rejection: 60 V rms
Trip interlock isolation: 1500 V
Trip inputs: 7
Trip interlock Current: 2.5 mA
Size: 17.8 cm wide x 33.02 cm
Common Mode Voltage Range: ±5 V
Operating temperature: 0 to 65 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721L


IS210TREGH2B is a Gas Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the VI Series used in GE Speedtronic Gas Turbine Control Systems. The Gas Turbine Emergency Trip (TREG) terminal board provides power to three emergency trip solenoids and is controlled by the I/O pack or control board. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards. TREG provides the positive side of the DC power to the solenoids and TRPG provides the negative side. The I/O pack or control board provides emergency overspeed protection, and emergency stop functions, and controls the 12 relays on TREG, nine of which form three groups of three to vote inputs controlling the three trip solenoids. H1B is the primary version for 125 V DC applications. Control power from the JX1, JY1, and JZ1 connectors are diode combined to create redundant power on the board for status feedback circuits and powering the economizing relays. Power separation is maintained for the trip relay circuits. H2B is used for 24 V DC applications. All other features are the same as H1B.


The three trip solenoids, economizing resistors, and the emergency stop are wired directly to the first I/O terminal block. Up to seven trip interlocks can be wired to the second terminal block.


TREG is entirely controlled by the PPRO / YPRO I/O pack or IS215VPRO board. The connections to the control modules are the J2 power cable and trip solenoids. In simplex systems, a third cable carries a trip signal from J1 to the TSVO terminal board, which provides a servo valve clamp function upon turbine trip.


  • Both TRPG and TREG control the trip solenoids so that either one can remove the power and actuate the hydraulics to close the steam or fuel valves. The nine trip relay coils on TREG are supplied with 28 V dc from the PPRO / YRPO I/O pack or IS215VPRO board.
  • The trip solenoids are supplied with 125 V dc through plug J2 and draw up to 1 A with a 0.1 second L/R time constant. A separately fused 125 V dc feeder is provided from the turbine control for the solenoids, which energize in the run mode and de-energize in the trip mode.
  • Diagnostics monitor each 125 V dc feeder from the power distribution module at its point of entry on the terminal board to verify the fuse integrity and the cable connection.
  • Two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder for each solenoid, and two series contacts from each primary trip relay (PTR1, 2, 3 in TRPG) are connected to the negative 125 V dc feeder for each solenoid.
  • An economizing relay (KE1, 2, 3) is supplied for each solenoid with a normally closed contact in parallel with the current limiting resistor. These relays are used to reduce the current load after the solenoids are energized.
  • The ETR and KE relay coils are powered from a 28 V dc source from the I/O controller. Each I/O controller in each of the R8, S8, and T8 sections supplies an independent 28 V dc source.

WOC has the largest stock of GE Speedtronic gas turbine control system replacement parts. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


What is a gas turbine emergency trip terminal board?

A gas turbine emergency trip terminal board is a critical component of a gas turbine control system. It serves as a central hub for emergency shutdown signals and trip commands in the event of a critical fault or hazardous condition.

What is the primary function of the emergency trip terminal board?

The primary function is to rapidly and safely shut down the gas turbine in emergencies to prevent damage to the equipment, personnel, and the surrounding environment.

What are some common signals that trigger an emergency shutdown?

Signals such as high exhaust temperature, low lubricating oil pressure, flame detection failure, overspeed, or any other condition that poses an immediate risk to the turbine operation can trigger an emergency shutdown.