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Good advice except I would wire the thermal fuse directly into the AC circuit together with the heater. That way even if the SSR fails the fuse will cut off the heater. As Mike mentioned high current ones are hard to get but they are commonly used in heaters and hair driers.
Also keep in mind that some connectors should be polarized.
Bertho
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, June 28, 2016 17:55
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] Preferred orientation for each electrical connection ?
Whichever side of the mating connector pairs that has a voltage present when disconnected should be the most physically protected, usually the female (socket) side. Based on that I would say the following would be the proper choice.
Thermistor – probably doesn’t matter
Thermal fuse – socket header on board (assumes a voltage would be present on the board connector if the pair were disconnected)
Battery power and ground – pin header on board
Ext relay – socket connector on board
Mike K5ESS
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, June 28, 2016 4:20 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Preferred orientation for each electrical connection ?
I'm making my first PCB for a thermostat for
an electric heater. I need to connect the
electronics to several outside components:
- a thermistor that goes in the oven
- an thermal fuse to shut off power if it gets too hot
- battery power & ground
- 3-conductor connector to an external solid-state relay
I plan to use pin headers and matching sockets for each of
these four connections. For each of these four connections,
what criteria should I use to determine whether to put the
pin header on the PCB and the matching socket on the connect-
ing cable, or vice versa ?
The thermostat itself and the SSR will fit into a plastic box that
also contains the battery. So my question pertains to orient-
ing the headers/sockets inside the plastic box. None of
the connections will ever be disconnected without first removing
fo ur retaining screws from the lid of the plastic box.