Datasheet PR515x505

Signal converters and isolating amplifiers

Issued 3 November 2026

PT100 thermostat with relay, adjustable switching point and hysteresis, with OLED display

Article number PR515x505

PR515 module in horizontal DIN rail enclosure, front three-quarter view, with screw terminals and USB-C port

The PR515x505 measures the temperature with a PT100 sensor in a 2-, 3- or 4-wire connection and switches a relay contact at a set switching point. The hysteresis determines how many degrees the temperature must drop back before the relay switches again, so a heater, cooler or fan does not keep switching on and off. You choose whether the relay switches on above or below the switching point. The OLED display shows the current temperature and the state of the relay.

Price on request. Supplied in series, from 10 units per item. Not in stock? Then we build your series. One or a few units only as a trial, for a company with a series in sight.

Specifications

Supply12 and 24 V DC, operating range 11 to 30 V DC
InputPT100, 2-, 3- or 4-wire
Measuring rangeAdjustable, for example −50 to +150 °C
OutputRelay contact (normally open)
IsolationNot galvanically isolated; isolated version as an option
SetupOLED display with UP, DOWN and OK buttons
Switching pointSwitching point and hysteresis adjustable in °C; switch on above or below the switching point
USBUSB-C for software updates and reading the status
Wi-FiBuilt-in hotspot for software updates
MountingDIN rail, horizontal enclosure
Internally fitted withPR181T23

Setup

  1. Connect the supply, the PT100 and the relay contact according to the wiring diagram supplied with the module.
  2. On the display, set the switching point and the hysteresis, and choose whether the relay switches on above or below the switching point.
  3. Check the temperature and the relay state on the display and store with SAVE.