The WAUX-KA5 is designed specifically for use with the TCS WOW101 decoder. It's a Keep-Alive® energy storage device that supplies continuous power to the decoder whenever the locomotive loses track contact, paired with a built-in auxiliary harness that also routes the decoder's auxiliary outputs for additional functions.
The KA5 packs five supercapacitors for higher storage capacity and peak voltage than a KA3 or KA4, keeping your locomotive moving and headlights lit for roughly 6–20 seconds through dirty track, frogs, and other dead spots.
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Will this work with any TCS decoder?
No. The WAUX-KA5 is built specifically for the TCS WOW101 decoder. For other TCS decoders, use the KA5-P or another appropriate Keep-Alive model.
What's the difference between this and the KA5-P?
Both use the same 5-supercapacitor bank, but the WAUX-KA5 adds a dedicated auxiliary harness wired for the WOW101's extra function outputs. The KA5-P has a simpler 2-pin plug for decoders with a standard Keep-Alive socket.
How long does it keep the loco running?
Roughly 6–20 seconds depending on the locomotive's motor efficiency and what lighting/sound functions are active.
Do I need to solder anything?
No. The harness is pre-wired with the connectors needed for a WOW101 installation.
