Danfoss ST-2 safety thermostat
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Product Description
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
- 2
- 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
Standards & Compliance
- 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
- Classification / Approval
- CE
- HS Code
- 9032.10
Compatibility & Fitment
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.
Product Documentation
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Technical guides
- Temperature Sensor Finder — Pt 100 / Pt 1000 / NTC / Thermocouple, Danfoss MBT 5250 / 5252 / 5560 / 3560 / 153, Siemens SITRANS TS500 by Insertion Length, Process Connection and Output
- Cross-Referencing Danfoss Refrigeration Components by IMPA and OEM Code
- Danfoss Product Code Decoder — 003Z, 013G, 017B, 023U, 027L, 032F, 060G, 060H, 065B, 065Z, 068Z, 084H, 132F, 148B Series (Complete Reference)
Catalogue entry last verified: 2026-08-24. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 087N1051?
- 087N1051 can be ordered from cballast.com as a Danfoss catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this Danfoss product?
- The manufacturer part number is 087N1051.
- What is the HS code for 087N1051?
- The customs tariff (HS) code for 087N1051 is 9032.10.
- Who manufactures 087N1051?
- 087N1051 is a Danfoss product in the Sensors & Instrumentation range.
- Is a datasheet available for 087N1051?
- Yes — the 087N1051 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 087N1051?
- The minimum order quantity is 1.
- Is 087N1051 available?
- Yes — 087N1051 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).