The IS200TBCIH2B: an H2-Group Contact Input Board

The IS200TBCIH2B is a GE Speedtronic Mark VI contact input terminal board (TBCI) built on the H2 hardware group. Like every TBCI, it is the place where up to 24 dry contacts from the field are landed and conditioned before the control reads their state. What separates one H-group and revision from another is the electrical build — the excitation arrangement the board is set up for and the specific artwork revision — so identifying the group correctly matters more on this board than on many others.

Match the Group and Revision Before You Order

GE builds the TBCI in more than one hardware group. The H1 group is documented at 125 V dc contact excitation; the H2 group is a distinct group, so before you order, confirm the excitation the circuit uses and match the group exactly instead of assuming H1 and H2 interchange. Within a group, boards at different revisions — for example the BBC tail on IS200TBCIH2BBC versus another BB-series revision — are close relatives but can differ in connector keying and in the ID device the pack reads. The practical rule is to order the complete part number, group and revision included, and match it to the board you are pulling. Our GE Speedtronic Part Number Decoder shows how each character maps to a build attribute.

How the TBCI Terminates and Conditions Field Contacts

Two barrier-type terminal blocks, each removable with two screws for maintenance, land the field wiring — up to #12 AWG per terminal — for 24 dry contact inputs. The board supplies the DC voltage that wets those contacts and carries noise-suppression circuitry to absorb surge and high-frequency noise, so field runs do not trigger false state changes. From the board, molded-plug cables carry the signals to a Mark VI VME contact processor (the VCCC or VCRC), or PDIA I/O packs mount directly to the board in a Mark VIe architecture. A simplex point uses connector JR1; a triple-redundant point uses JR1, JS1 and JT1 to feed the three control channels.

Rule the Board Out Before You Swap It

A TBCI is largely a passive termination, so most input faults are not the board. Check in this order: the field device and wiring for a single misbehaving point; the PDIA pack or VME processor and its cable when a whole group of inputs disappears at once; the contact-excitation supply when every point reads the same; and the connectors for intermittent behavior after maintenance. Reserve replacement for boards with real, visible damage — cracked blocks, burnt terminals, corrosion, or heat marks around the suppression components.

Boards That Share the Cabinet

The IS200TBCIH2B works next to its mating VCRC/VCCC VME processor or PDIA packs and alongside the relay-output and analog terminations of the same generation. If your site mixes control vintages, the Mark V vs Mark VI: DS200 to IS200 guide explains why Mark V DS200 discrete boards do not substitute for IS200 hardware. Additional Mark VI terminations are listed in the GE Mark VI IS200 Boards collection.

Quote Checklist for the IS200TBCIH2BBC

For an accurate match, send the full part number with suffix (IS200TBCIH2BBC), the revision printed on the board label, a photo of the label, the turbine model and Mark VI generation it serves, the quantity required, and your timeline. Noting the excitation voltage of the circuit helps us confirm the correct hardware group.

Request a Quote on the IS200TBCIH2BBC

We ship the IS200TBCIH2B worldwide DDP, return a quote within 24 hours, and accept purchase orders from qualified plants and integrators. Press Request a Quote with your quantity and we will confirm availability and lead time — no account needed to ask.

IS200TBCIH2BBC Unit Details

General Information about the Product
Part Number	IS200TBCIH2B Mark VI IS200
Description	GE General Electric IS200TBCIH2B IS200TBCIH2BBC Contact Input Terminal Board Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.