Help identifying this through hole component.
No identifying markings.
Exploded when water dripped on the PCB.
PCB E0287100E.
Assy E0286400 from a Jandy variable speed pool pump speed drive 2.0Hp FloPro. PCB indicates 94V
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1\$\begingroup\$ Can you show a schematic of where it was connected in the circuit? \$\endgroup\$– HearthCommented Jan 24, 2019 at 16:03
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\$\begingroup\$ Through hole, pool pump, explodes sounds like an ICL. digikey.com/short/ptz29d Hard to tell specs without more info. \$\endgroup\$– Robert FayCommented Jan 24, 2019 at 16:11
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\$\begingroup\$ I have requested a schematic from the mfg. nothing so far. unable to remove the board as it appears to be anchored in resin. I am adding a top view of the board with errors where it connected, the part was on the underside at the bottom of the oblong hole. \$\endgroup\$– tyoungpspCommented Jan 24, 2019 at 16:15
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1\$\begingroup\$ You don't need to ask the manufacturer; trace out the board and draw one yourself. It doesn't need to be the whole board, just the bit near that component. \$\endgroup\$– HearthCommented Jan 24, 2019 at 16:20
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2\$\begingroup\$ 94V is not 94 volt, but rather flammability rating according to UL 94V, V for vertical. \$\endgroup\$– winnyCommented Jan 24, 2019 at 17:27
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1 Answer
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Not much to go by, but by the way it was mounted, how it reacted, and the looks of it it seems to be an inrush current limiter a.k.a., negative temperature coefficient (NTC) thermistor.
These are designed to run hot, they could be ~100°C during normal operation unless additional circuitry is placed to avoid it. A drop of water in something like that would put a lot of sudden mechanical and electrical stress.
The size and package of it would help you to narrow down the range of possibilities (the variety of this type of components is not very high, perhaps not even a hundred types). But you will still have a few possibilities, you might need to reverse-engineer the schematic and circuit function to figure out the exact one.
answered Jan 24, 2019 at 16:24