The Train Control Systems KA1 Keep-Alive® is a compact stay-alive capacitor pack that feeds backup power to your DCC decoder whenever the wheels lose contact with the rails. No more stalling on dirty track, dead frogs, or insulated turnouts. The KA1 comes in at about half the size of a KA3 and delivers roughly one-third the capacitance of a KA3/KA4, making it a great choice where space is tight in N and smaller HO locomotives. It includes Blue and Black-with-White-stripe lead wires to solder to your decoder's keep-alive pads (V+ and ground), so it works with TCS and most other-brand decoders that accept an external keep-alive. Browse more decoder add-ons in our DCC Accessories collection, shop the full Train Control Systems lineup, or pair it with a new sound decoder from our DCC Decoders collection. Features Keep-Alive® stay-alive capacitor pack eliminates stalling on dirty track, dead frogs, and insulated rail joints. Compact — about half the size of a KA3; delivers roughly one-third the capacitance of a KA3/KA4. Includes Blue and Black/White lead wires to solder to your decoder's keep-alive pads — works with TCS and most other-brand decoders. Dimensions: 1.063" x 0.35" x 0.244" (27 x 8.9 x 6.2 mm). Input rating 12–16V; works with any scale and any DCC system. More Information Brand Train Control Systems (TCS) Item Number 1454 (KA1) Type Keep-Alive / Stay-Alive Capacitor Pack Connection Blue + Black/White Wire Leads (solder-on) Dimensions 1.063" x 0.35" x 0.244" (27 x 8.9 x 6.2 mm) Input Rating 12–16V Scale Any Scale Condition New FAQ What does a Keep-Alive actually do?It stores an electrical charge and feeds it to your decoder when track power drops out, so the locomotive keeps moving and its lights and sound stay on across dirty track, frogs, and gaps. How do I connect the KA1?Solder the Blue wire to your decoder's keep-alive positive (V+) pad and the Black/White wire to the ground pad. It works with TCS decoders and most other brands that offer keep-alive connections — check your decoder's manual for the correct pads. Why choose the KA1 over a larger KA3/KA4?It's much smaller and fits where bigger packs won't — ideal for N scale and cramped HO shells. It holds less charge, so for longer run-through use a KA3 or KA4 if you have the room.
