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