Power Supplies
Regulated DC power supplies for reliable, stable power to panel-mounted control electronics.
About Power Supplies
A switch-mode power supply (SMPS) converts the AC mains into a regulated, low-voltage DC output — usually 24 V DC — to run the control side of a panel: PLCs, HMIs, sensors, relay coils and indicator lamps. It rectifies the input and switches it at high frequency through a compact transformer, which makes it far smaller and more efficient than an old linear transformer-rectifier supply.
Microtech supplies DIN-rail SMPS from Omron and Connectwell. The Omron S8VK-G range covers 15 W to 480 W at 24 V DC with a wide 85–264 V AC input, while Connectwell offers single-phase DIN-rail units from 60 W to 480 W, plus redundancy modules for panels where a single supply failure must not stop the process.
We size the supply for the steady load plus the inrush of relays, solenoids and capacitive loads, and leave headroom for future I/O. The same supplies are used in the control panels we build, so a spare taken from our stock is a direct swap.
Key specifications
| Output voltage | 24 V DC (other voltages on selected models) |
|---|---|
| Output power — Omron S8VK-G | 15, 30, 60, 120, 240 and 480 W |
| Output power — Connectwell | 60 W (2.5 A), 120 W (5 A), 240 W (10 A), 480 W (20 A), single-phase |
| Input — Omron S8VK-G | 100–240 V AC (85–264 V AC allowable); 90–350 V DC |
| Efficiency | Above 91% on Connectwell SMPS; up to about 93% on Omron S8VK-G 480 W |
| Operating temperature — Omron S8VK-G | −40 °C to +70 °C |
| Protection | Short-circuit, overload and over-voltage protection |
| Mounting | 35 mm DIN rail |
Features & benefits
- Regulated 24 V DC for PLCs, sensors and relay coils
- Universal AC input that tolerates supply variation
- Boost current capability (120% on Omron S8VK-G) to start relay and capacitive loads
- Active power factor correction on Connectwell units
- Remote signal indication terminal for alarm monitoring on Connectwell units
- Redundancy modules so two supplies can share a critical 24 V bus
- Compact DIN-rail housings to save panel space
Where it’s used
- PLC and automation control panels
- MCC and drive panel control circuits
- CNC machine panels
- Process plant instrumentation
- Building management and HVAC controls
Standards & compliance
Power Supplies — FAQs
How do I choose the right SMPS rating for my panel?
Add up the steady current of everything on the 24 V circuit — PLC, I/O, sensors, relay coils, lamps — then allow for start-up surges and leave spare capacity for future I/O rather than running the supply at its full rating.
What is a redundancy module and do I need one?
A redundancy module lets two power supplies feed the same DC bus, so if one fails the other carries the load without a break. It is worth fitting where a 24 V failure would stop a continuous process or a safety system.
Can an SMPS run from a DG set supply?
A wide-input SMPS such as the Omron S8VK-G accepts 85–264 V AC, which gives margin against the voltage swings common on generator supplies. We still recommend surge protection at the panel incomer.
