Instruction Manual

Contacts: color code and function

Lower contacts Upper contacts

C = Common = purple C = brown

NC = Normally Closed Contact = blue NC = orange

NO = Normally Open Contact = red NO = yellow

Fig. 11: Temperature switch type L2H-…

Contact Protection

The micro switches used are normally suitable for both direct and alternating current operation.

Inductive, capacitive and lamp loads may, however, considerably reduce the life expectancy of a micro

switch and, under extreme circumstances, even damage the contacts.

Depending on the application spark suppression and current limiting is recommended (see succeeding

figures).

Fig. 1: Protection in case of capacitive loads

R1: Protection against starting current

rushes R2,R3: Protection against high

discharge currents

Fig. 2: Lamp load provided with resistance in

series or parallel connection to switch

of condensers

Fig. 3: Protection in case of continuous

current and inductive load by recovery

diode

Fig. 4: Protection in case of alternating

current and inductive load by RC-link

¾“ NPT

Option adjustable

hysteresis (RD)

Adjustment knob

High circuit S2

Adjustment knob

Low circuit S1

22 (0.87)

51 (2.01)

102 (4.016)

Ground screw

115 (4.53)

86 (3.39)

71 (2.795)

51 (2.01)

½" NPT

19 (0.756)

ø14.5 (0.43)

63.5 (2.5)

Load

C cable

Diode

Load