What the IC3600SIXL1A1A Relay Module Extender Card is for

The IC3600SIXL1A1A is a relay module extender card in the IC3600SIX group of GE's Speedtronic Mark I / Mark II control system, GE's earliest Speedtronic generation. As its name indicates, it extends the connection to a relay module — providing the interconnect that links the relay hardware into the control rack. It is a different animal from its SIX-group siblings: the SIXJ selects power, the SIXK senses power, the SIXM interfaces, and this SIXL handles the relay-module extension. Matching the correct letter is therefore essential.

An extender card is, by nature, largely an interconnect. That single fact drives how you should approach any fault that seems to involve it, because the extender is rarely the active element in the circuit it serves.

Extender faults are often the mated module

When something on an extended relay module misbehaves, the extender is an easy but frequently wrong suspect. Check the connections and the module before the card:

• Reseat both ends. An extender adds connection points, and every added contact is a place for oxidation or a loose seat to cause intermittent behavior. Reseat the extender and the relay module and clean the mating surfaces first.
• Suspect the mated module. A fault on the relay module it serves will present as though the extender failed. Test or substitute the relay module before condemning the extender.
• Confirm continuity through the extender. Because the card is mostly interconnect, a straightforward continuity and seating check often confirms whether it is passing signals correctly.
• Check the rack side. Verify that the backplane slot the extender plugs into is clean and undamaged; a rack-side problem imitates an extender failure.

Approaching an extender as a connection first and a component second usually finds the real fault faster — and keeps a hard-to-find spare on the shelf.

How to read the IC3600SIXL1A1A number

IC3600 is the Mark I / Mark II card series, SIX the group and L this specific card, the relay module extender — not the J, K or M cards. 1A1A is the revision or dash detail to match with the base. As with the whole SIX group, the letter after SIX together with the trailing suffix is what pins down the exact card. Our GE Speedtronic Part Number Decoder covers the scheme.

Companion SIX-group and relay-driver cards

In service the SIXL sits among the other SIX-group cards — the SIXJ selector, SIXK sensor and SIXM interface — and it relates naturally to the panel's relay hardware and its IC3600LRD relay drivers. Keeping the matching relay module and a known-good extender on hand makes connection-related faults much quicker to resolve. Browse the group in our GE Mark I-II IC3600 Cards collection, or the broader control range in GE Speedtronic Turbine Control Boards. This card is Mark I-II specific and does not interchange with later Speedtronic hardware; the generation also predates the triple-redundant R/S/T voting architecture.

Information to include with your request

To match the exact extender, please provide:

• The full part number and suffix as printed on the board, for example IC3600SIXL1A1A.
• A photo of the card label and the board if you can.
• Turbine model and Speedtronic generation (Mark I or Mark II).
• Quantity and how urgently it is needed.

Request a quote for the IC3600SIXL1A1A

This IC3600SIXL1A1A is a used card, cleaned and tested. Click Request a Quote for a response within 24 hours. We ship worldwide DDP, accept purchase orders from qualified organizations, and can help confirm the matching relay module or companion SIX-group cards.

General Information about the Product
Part Number	IC3600SIXL1A1A Mark I-II IC3600
Description	IC3600SIXL1A1A By GE Speedtronic IC3600SIXL Relay Module Extender Card
Condition	used Clean and Tested With 1 Year Warranty.