The Keep-Alive™ (KA) devices are used to supply power to decoders during times of power interruption due to dirty track or problematic track work.

Read what other customers have had to say about the TCS Keep-Alives™ HERE and check out a video demonstration HERE.

Check out this demonstration of installing a Keep-Alive™ in an N-Scale Locomotive.

NOTE: Scroll to the bottom of this page for important notes on using the TCS Keep-Alives.

KA2 KA2-C
SKU: 1456 SKU: 1457
(With Black w/ White Stripe wire and Blue wire for power) (With 2-Pin Quick Connector Harness for power)

KA2 will power an HO-Scale locomotive with headlights on for approximately 6 to 15 seconds (depending on the locomotive and the efficiency of the motor).

Dimensions: 1.296" x .458" x .347" or 32.92mm x 11.63mm x 8.81mm




KA3 KA3-C
SKU: 2000 SKU: 2001
(With Black w/ White Stripe wire and Blue wire for power) (With 2-Pin Quick Connector Harness for power)

KA3 will power an HO-Scale locomotive with headlights on for approximately 6 to 20 seconds (depending on the locomotive and the efficiency of the motor).

Dimensions: 1.02” x .45” x .347” or 25.9mm x 11.43mm x 8.81mm





KA4 KA4-C
SKU: 1668 SKU: 1667
(With Black w/ White Stripe wire and Blue wire for power) (With 2-Pin Quick Connector Harness for power)

KA4 will power an HO-Scale locomotive with headlights on for approximately 6 to 15 seconds (depending on the locomotive and the efficiency of the motor).

Dimensions: .52” x .52” x .45” or 13.22mm x 13.22mm x 11.55mm






Keep-Alive™ Usage Notes:

All TCS decoders shipping with date codes from January 2012 support the Keep-Alive feature.

To enable the Keep-Alive™ feature place a value of 2 in CV 182. This essentially disables DC mode and the decoder will remain in DCC operation during brief power interruptions.

These KA's are designed for a maximum track voltage of 16v.

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