Danfoss ST-2 safety thermostat

Part Number
087N1051 · HS 9032.10

Danfoss ST-2 combined safety thermostat for district heating/cooling circulation water, integrating a safety temperature limiter (STB, manual-reset lockout) plus temperature regulator (TR) in one housing with two temperature sensors. Safety limiter STB: 95 °C (fixed), manual reset. Regulator TR setting: 30 to 90 °C. Sensor pocket brass Ms 58 / copper, R ½ connection, 9 mm dia x 100 mm sensor, PN 10 bar, IP40, Pg 20 cable entry. OEM P/N 087N1051. EAN 5702421715024. Verbatim technical data from store.danfoss.com (code 087N1051).

Technical Specifications

Type

ST-2

Code number

087N1051

Product group

Safety thermostats

Function

safety temperature limiter (STB, manual-reset lockout) plus temperature regulator (TR)

Safety limiter STB

95 °C (fixed), manual reset

Regulator TR setting

30 to 90 °C

Differential STB

12 (±3) K; Differential TR: 4 (±1) K

Number of temperature sensors

Cut-out accuracy

0 to 6 K

Permissible media

District heating/cooling circulation water

Nominal pressure

10 bar

Sensor connection

R ½

Sensor pocket material

Brass Ms 58 / copper

Sensor diameter

9 mm

Sensor length

100 mm

Max sensor temperature

130 °C

Contacts

Ag 1000/1000

Contact rating (ohmic)

10 A

Contact rating (inductive)

2.5 A

Contact rating (three-phase)

7 A

Cable entry

Pg 20

Grade of enclosure

IP40

Mounting orientation

No restriction

Ambient temperature (max)

80 °C

Net weight

0.458 kg

Gross weight

0.458 kg

EU RoHS

Yes (with exemption 6(c))

China RoHS

Out of scope

REACH candidate-list

Lead (CAS 7439-92-1)

EAN

5702421715024

Danfoss ST-2. ST-1 (087N1050) is an auto-reset safety monitor; ST-2 (087N1051) is a manual-reset safety limiter — select per the plant safety concept (EN 14597). Confirm sensor pocket length and R ½ connection.

Material	Sensor pocket brass Ms 58 / copper; contacts Ag 1000/1000
Pressure rating	10 bar
Temperature range	STB 95 °C manual-reset + TR 30-90 °C
IP rating	IP40
MOQ	1

Danfoss ST-2 safety thermostat

Technical Specifications

Properties

Compatibility

Approvals

Attached Documents