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Protection For Coils / Windings

Thermal Cut-outs/Bimetal Thermostats

This thermostat operates as a thermal cutout. A thermally sensitive bimetal snap-element with double contacts either opens or closes an electrical circuit by switching at a pre-set response temperature. Reset follows automatically after a considerable drop in temperature.

B12 / B13 (Double Contacts)

Applications

Single Phase Motors, Generators, Convertors, Transformers, Pumps, Heating Elements, Signal Transmitters, Fire Detectors, Magnets, Relays, Chokes, Coils, Power Supplies, Inverters

Technical Data

ratings B12A / E B12B / G B13N / T
version normally closed Cantherm Code=2 nnormally open Cantherm Code=1 normally closed / open
rated current at 250 V 50/60 Hz (cos 0.95/0.6) 6.3 A / 6.0 A 10.0 A / 6.0 A 13.0 A / 6.0 A 5.0 A / 1.6 A 1…100 mA (24 Vdc)
switching cycles under rated current  10,000  5,000  1,000  5,000  10,000
max. current under failure condition at 250 V 50/60 Hz (power factor 0.95) 30.0 A
switching cycles under max. current 100
temperature rating Ta (steps in 5 K) 70°C…160°C 70°C…155°C 70°C…160/155°C
tolerances standard:+/- 5 K
feature of automatic action 1.B.M, 2.B, 1.C 1.B
contact resistance ( incl. wire of 100 mm ) < 50 mΩ
hysteresis 30 K ± 15 K1
dielectric strength ( standard insulation ) 2 kV
shock- / vibration testing( similar to EN 50155 ) 400 m/s2sine half wave / 100 m/s2 5 Hz … 2,000 Hz sine
resistances to impregnation tight against ordinary resins and lacquers
degrees of protection provided by enclosures ( EN 60529 ) IP00
suitable for use in protection category I, II
approvals VDE / ENEC EN 60730-1 / -2-3 2) /-2-9
UL UL 2111 / UL 873 3)
CSA / cUL C22.2 No. 77 / C22.2 No. 24 3)
CQC GB14536.1-1998 / GB14536.10-1996 3)
1) at the Ta (upper and lower) limits the hysteresis could deviate
2) different power rating
3) details on request

Standard wire ( length 100 ± 10 mm, stripped 6 ± 1 mm )

lead Cantherm
code
temp. max. operating
voltage max.
diameter insulation cross section diameter2) UL style
black ACDA 150° C 300 V 1.57 mm AWG24 / 0.24 mm2) 3266
or
3398
yellow AEDC 1.80 mm AWG20 / 0.48 mm2)
black AFDA 2.15 mm AWG18 / 0.96 mm2)
white LCDB 200° C 600 V 0.90 mm AWG24 / 0.24 mm2) 3557
white LEDB 1.26 mm AWG20 / 0.61 mm2)
white LFDB 1.50 mm AWG18 / 0.96 mm2)
black ASDA 3) 150° C 300 V 1.65 mm AWG20 / 0.81 mm 3266
or
3398
white DEDB 200° C 300 V 1.51 mm AWG20 / 0.81 mm 1180
2)AWG20 is recommended
3)Solid Wire
NOTE: Additional wires available upon request.

Standard insulation

control type nc no Cantherm code illust. drawing dimensions (mm) technicals specification approvals1)
B12 A B Class B U103 | C

Class F U107 | G

MIC Version Shown

shrink cap
potted
VDE,UL, cUL
B13 N T
B12 A B U155 | X

U186 | 3

cap of PPS
potted
VDE, UL, cUL
B13 N T

Specific variations U= insulation G= Housing

control type nc no Cantherm code illust. drawing dimensions (mm) technicals specification approvals1)
B12 A B none | 0 not insulated
potted
VDE,UL,cUL, CSA
B13 N T
B12 A B U112 | L epoxy coated VDE,UL, cUL
B13 N T
B12 A B U294 | G housing of PPS

potted

VDE,UL, cUL
B13 N T
B12 A B Wire A800 | IZA not insulated

potted

VDE,UL, cUL
B13 N T
B12 E G G702 | C aluminum housing

thread M4x6

potted

Ta max. 150†C

VDE,UL, cUL
B13 N T
B12 E  G G714 | F brass housing

thread M4x5

potted

Ta max. 150†C

VDE,UL, cUL
B13 N T

Heating by current

The diagram is measured with a thermal control without any insulation in an oil bath.
Attention:
The heating depends on the thermal conduction of the control to the equipment or part which should be protected.

Ordering & Marking Example

Cantherm Ordering Example [ B12A12005AEDCC0E ] standard version
B12 A 120 05 AE FD C C O E
type normally closed temperature tolerance +/-5°C wire leads UL3398 20 AWG length D=4″ color yellow insulation U103 housing – none strip .25″
Marking
B12A type (B12 nc)

12005 response temperature (120°C), tolerance (± 5K)

112C date of manufacture (Nov. 2012), country (C = Canada)