Honeywell STB-TW, STB DATASHEET

Mechanical Thermostats

Temperature monitors and limiters

The temperature monitors and temperature lim-

iters meet the requirements of DIN 3440 and can

thus be used for heating systems according to

D

IN 4751, steam and hot water systems and

district heating systems. The devices with safety

function (STW, STB) are self-monitoring, i.e. in

the event of breakage or leaks in the measuring

system the circuit is opened and the system is

s

witched off to the safe side.

Technical data

Body Diecast aluminium with

plastic cover.

Immersion tube Brass G 1/2”,

i

ncluded with product

Stainless steel G 1/2”,

order separately.

Type T4NSTF or T5NSTF,

see Product Summary

Max. ambient +80°C at the switching

temperature head

Switching point (in upper third of scale)

accuracy for TW, STW, STB:

± 5 %

for

TR:

± 1.5 %

(in % of scale range)

Switching (in % of scale range)

differential for TR, TW: 3–4 %

for STW, STB: 4–6%

Lead seal The cover of the switching

device can be lead sealed

so tha

t the internal settings

of the limiter switching

points are no longer acces-

sible after sealing.

Switching 10 (2)

A,

250

V

AC

capacity

Degree of

IP 54

protection

STB series temperature monitors

and limiters

Tested according to DIN 3440

STB+TW

Connection schemes:

In devices with a dual function there are 2 switching elements. Pay attention to the function of the rele-

vant switch when connecting.

tested

Degree of protection:

IP 54

s

3

0

TW, STW, TR

STB

Type

Function

Setting range

TÜV test

cer

tificate

Setting

Controls

accessible

from outside

Contact

Reclosing

lockout

(internal)

Max. tempera-

ture at sensor

Immersion

depth

Permitted

pressure,

brass immer-

sion tube

Permitted pres-

sure, stainless

steel immer-

sion tube

STW 1F

Safety temper-

ature monitor

20 to 150° C

STW (STB)

89401S

internal

none

Changeover

no

175°C

150 mm

40 bar

80 bar

T4NSTF

STW + TRF

Safety temper-

ature monitor

and controller

20 to 150° C

TR/STW (STB)

89901S

STW internal

TR external

Setting wheel

for TR

2 x change-

over

no

175°C

150 mm

25 bar

40 bar

T5NSTF

STB + TWF

Safety temper-

ature limiter

and monitor

30 to 110° C

TW / STB

90401

STB internal

TW internal

Reclosing but-

ton

NC (STB) and

changeover

(TW)

yes

130°C

150 mm

25 bar

40 bar

T5NSTF

STB + TRF

Safety temper-

ature limiter

and controller

30 to 110° C

TR / STB

90001

STB internal

TR external

Reclosing but-

ton and set-

ting wheel for

TR

NC (STB) and

changeover

(TR)

yes

130°C

150 mm

25 bar

40 bar

T5NSTF

STB 1F

Safety temper-

ature limiter

60 to 130° C

STB

89501

internal

Reclosing but-

ton

NC

yes

150°C

150 mm

40 bar

80 bar

T4NSTF

TWP 1F

Temperature

monitor

20 to 150°C

TW

89201

internal

none

Changeover

no

175°C

100 mm

40 bar

80 bar

T4NSTF

S

TB