DC-Contact SO / SS
The DC contact block is used for signalling and announciation applications.
The snap-action mechanism prevents slow contact opening when the plunger is operated slowly. Quenching of the arc that occurs with DC is suopported by two-capacity permanent magnets.
These are arranged so that the polarity can be ignored when connecting +/- cabling. However, the polarity of the quenching magnets must be noted when installing the contact blocks to prevent the magnets adversly affecting each other. Contact blocks in four different colours are available for polarity identification of the magnets when fitted.
The contact blocks may only be installed on non-magnetizable materials with screw, etc. made of
non-ferrous metal.
The self-cleaning silver contacts are designed for low switching frequency, low currents and voltages. Gold coated contacts can be supplied (approx 0,2µ), less than 42 Volt required. The screw connection M3.5 at the side is suitable for 2 conductors max. 2,5mm².
The plug-in connection at the top 4.8 x 0.8mm DIN 46247.
Several contact blocks can be plugged on the top of each other and operated jointly. The plug-type terminals are then only accessible on the top unit. The contact blocks can be provided with shock protection to DIN VDE 0106 Part 100.
Switching capacity
NC NO Time constant
250V DC 2A 1A 20ms
125V DC 4A 3A 20ms
50V DC 6A 6A 20ms
30V DC 10A 10A 20ms
250V AC 15 6A 6A
Technical data
Mechanical life 2 milion operating cycles
Electrical service life 50.000 operating cycles (at 2A 250VDC L/R 20ms)
Operating temperature -40°C bis +60°C
Degree of protection IP40