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Most solid state relays I have need some form of heatsink . the thermal fuse only needs to interrupt power to the control board or the control signal to the relay. If your device draws more than 10 amps you can’t use a thermal fuse in the heater circuit , it will not carry the current
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, June 28, 2016 5:20 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
four retaining screws from the lid of the plastic box.