RDBSM DualCircuit Bimetal Thermostat

This device automatically senses relative humidity and directly activates connected equipment, such as dehumidifiers or heaters, to prevent condensation inside enclosures. It is typically configured as Normally Open (NO) for dehumidification mode; when humidity rises, the contact closes to activate the device. It supports a wide input voltage range of 100–270V, 50/60Hz, with a humidity setting adjustable in 5% increments. The unit also features a built-in status indicator LED and a fixed frost protection threshold set at 4°C.

Product Features

1. With a sensing accuracy of 5% RH (±3% error) at 25°C / 50% RH, this device features dual 8A 250V relay outputs (note: the second contact is a dry contact), offers two selectable humidity setting ranges (15–90% RH or 20–95% RH), and includes a five-pole terminal block for AWG 20–14 (0.5–2.5mm²) wires with standard wire protection sleeves and optional screwless terminals.
2. Its molded housing is designed for installation on standard 35mm DIN rails in compliance with EN 60715.

Specifications

Electronic humidity controller	EHT-2-220A
DBK Ordering Number	1150022	115023
Humidity setting range [RH].	15… 90% RH	20… 95% RH
Rated input voltage [V].	100-270 AC
Humidity setting difference (per level) [RH].	5% RH
Mode of contact	2 NO
Maximum switching capacity (relay output)	2 x 8A (240/120VAC resist.)
Sensing elements	Electronic
Connection (5 holes).	Screw AWG 20 -14 (0.5 - 2.5mm²) with wire protector
Dimensions (L x W x H) [mm].	49×65×61
Mounting bracket	Built-In clip for DIN rail EN 60715
Enclosure rating	IP20
Operating temperature [°C].	0 to 60
Storage temperature [°C].	-40 to 70
Electrical protection rating	II
enclosure	Plastic grey (RAL 7035)
weight	80
Anti-frost function	Yes (operates below 4°C).