This article expands on A flexible test panel for microcontroller based power control projects with some enhancements and accessories.
A LED power meter that I had ordered finally arrived (slow boat from China syndrome).
Above, the upper rail contains a RCD, the power meter which displays Volts, Amps, and kW, or pf, hours, and kWh, a DIN mount terminal block for mains, and a 40A SSR on a heatsink. A clip on CT can be used for oscilloscope observation of mains current.
The lower rail has a DIN mount terminal block for signals, a switched mode 12V PSU and piggybacked in the black ABS enclosure is a DC-DC converter to supply 24V for the 4-20mA devices, a DIN rail mount Pt100 4-20mA converter, and a hcctl prototype (with flying lead for bootloader programming of EEPROM calibration constants and firmware).
Above is a generic PID controller zip tied to a DIN rail bracket made for SSRs.
Above is a small opto isolated 5V relay board with inverting and non-inverting logic level drive. The relay PCB is mounted on a small piece of acrylic sheet which is in turn fixed to a couple of DIN rail PCB clips.
Above is a generic PCB vice drilled and screwed to a DIN rail bracket made for SSRs.
Above, one of several small switched mode mains power supplies in different voltages, and fixed to a DIN rail bracket made for SSRs.
A warning: don’t mess with this stuff unless you are competent, don’t take safety for granted, don’t allow access to persons who might not have the needed competency.