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itsmoked (Electrical) Used a clamp-type ammeter to measure steady-state current on two units: Boiler #1: 11.6A Boiler #2: 12.0A This was with the 15A breakers/switches (655-W33-T2N1Q-1)

CORRECTIONS The breaker switch is on the box which HOUSES an internal boiler. (not a separate panel for switch, so no fans allowed). We'll try a magnetic switch (higher heat tolerance). We are also looking to keep field modification costs down.

New PostLionelHutz (Electrical) Let me say something less "useless"... The internal breaker is a UL requirement, therefore it must be in/on the box. On that note, it must work also. BTW, There is a circuit board internal also, and it handles the heat fine. The small boiler puts out heat...

The datasheet was helpful. It appears to have the official name Non-Inverting Comparator with Hysteresis. Thanx All.

Can anyone explain this circuit to me? Why is the feedback resistor at the non-inverting input?

"I've not quite got my head around this, but can you cool the electrics? Are you saying that you are deliberately heating the electrics (i.e. they are in the same box as the heaters) or are they in a separate control panel? If the latter, could you not add a small cooling fan and vent? " The...

"you describe this as a box. Inside the box is a breaker feeding 3 x 10A fuses which each feed a heater. Outside the box is a cord plugged into an outlet which provides 120V power to the components inside the box. If this description is true, then it doesn't really matter what breaker you use...

itsmoked: I put in a request for that test. I'll see what happens. BTW, The short circuit triggered the short to the receptacle instantly. The tripping I'm trying to figure out is intermittent, doesn't happen all the time, but it happens when it shouldn'tgaaa... always not good. I'll be...

Originally this was a 15A breaker with three 120V, 500W heaters. The line wire is 14AWG. The problem was when the interior of the system heated up, there were intermittent trips in the 15A breaker. I calculated there is 1500W of power (theoretically) being drawn off by the heaters. [Maybe...

A system was designed with 1500W (3 heaters 500W each, and each fused at 10a) , and is 120VAc on a 15A circuit breaker, 14awg. They had intermittent tripping of the internal 15A breaker. More information came to light. With the box, temperatures reach to 51deg C (has a small internal boiler.)...