The Train Control Systems KA2-P 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 KA2-P comes in at about half the size of a KA4 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.
This is the harness-equipped version: it ships with a 2-Pin Quick Connector Harness that plugs straight into any decoder with a compatible 2-pin Keep-Alive socket, such as the TCS T4 and other current TCS decoders — no soldering to the decoder required.
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 KA4; delivers roughly one-third the capacitance of a KA3/KA4.
Includes a 2-Pin Quick Connector Harness — plugs into the TCS T4 and other decoders with a compatible 2-pin socket, no decoder soldering needed.
Dimensions: 0.35" x 0.35" x 0.61" (8.9 x 8.9 x 15.5 mm).
Input rating 12–16V; works with any scale and any DCC system.
More Information
Brand
Train Control Systems (TCS)
Item Number
2003 (KA2-P)
Type
Keep-Alive / Stay-Alive Capacitor Pack
Connection
2-Pin Quick Connector Harness
Dimensions
0.35" x 0.35" x 0.61" (8.9 x 8.9 x 15.5 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.
Will the KA2-P plug into my decoder?The included 2-pin harness plugs into TCS decoders with a compatible Keep-Alive socket (such as the T4) and most current TCS decoders. For decoders without a 2-pin socket, you can solder the leads to the decoder's keep-alive pads — check your decoder's manual first.
Why choose the KA2-P 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.
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