Danfoss ST-1, ST-2 Data sheet

Data sheet

Safety thermostats
ST-1/ST-2

Application

ST-1 ST-2

Ordering

Technical data

Safety thermostats ST-1 and ST-2 can be used in
directly or indirectly connected district heating
systems where extra safety is required.

ST-1 incorporates a thermostat (TR) and a safety
monitor (STW) with automatic reset.

If ST-1 or ST-2 is used together with an AMV(E)
13, 23, or 33 three-point controlled actuator, the
safety monitor (STW) or safety limit cutout (STB)
releases the spring return function for forced
closure of the motorized control valve.

The safety thermostats are approved in accord­ST-2 incorporates a thermostat (TR) with auto­matic reset and a safety limit cutout (STB) with
manual reset.

ance with DIN 3440 with the following

DIN Register Nos.:

ST-1: TR STW 1175 05

ST-2: TR STB 1176 05

Typ e

ST-1 (TR/STW) 30 - 120 oC 100 - 120 oC - 087N1050
ST-2 (TR/STB) 30 - 90 oC - 95 oC 087N1051

Accessory
Sensor pocket (Cu/Ms) for ST1 / ST2 087N12 01

ST-1 TR STW ST-2 TR STB
Setting 30 - 120 oC 100 - 120 oC Setting 30 - 90 oC 95 oC
Differential 4 ± 1 K 12 ± 3 K Differential 4 ± 1 K 12 ± 3 K
Reset Auto Auto Reset Auto Manual

Contacts Ag 1000/1000
Contact loads 10 (2.5) A 250 V ~ / 7 A 380 V ~
Max. ambient temperature 80 oC
Max. sensor temperature 130 oC
Cut-out accuracy +0 K - -6 K
Enclosure IP 40
Mounting direction No restrictions
Sensor connection R ½
Cable entry M 20
Pressure stage PN 10
Medium Water, pH 7 - 10
Sensor 2 off Ø 9 x 100
Sensor pockets (takes both sensors) Brass Ms 58/copper
Storage and transport temperature -15 oC - +80 oC
Approvals DIN 3440 and VDE 0631

TR STW STB

Setting

Code no.

© Danfoss | 2022.02

AI000086465317en-010701 | 1

Data sheet Safety thermostats ST-1/ST2

Electrical connections

Dimensions

ST-1 with Danfoss ECL Comfort 210/310 and AMV(E) 13, 23, or 33 connected

2 | © Danfoss | DCS-SGDPT/DK | 2022.02

AI000086465317en-010701