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DLS15

 
    
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The DLS15 is a bi-metallic strip delay switch. The switch contacts operated and HT was applied to the protected circuit after the pre-set delay caused by the time the heater took to heat the bi-metallic strip to the point where the differential expansion of the metals caused it to bend sufficiently to contact the fixed post.
See DLS16 for the same switch but with a 6.3 Volt heater.
The wide glass tube envelope is 30 mm in diameter and, excluding the B4 base pins, is 55 mm tall.
References: Datasheet & 4049. Type DLS15 was first introduced in 1949.

 

Pin Connections
B4
1
2
3
4
fc
mc
f
f

 

Absolute Maximum Operating Conditions
Delay
Vh
Ah
Va
mAa
4.0
0.75
240
5,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 31, 2013.
shape:wide.glass.tube construction:pinch type:thermal.delay.switch age:1940.1950 base:b4 heater:4.0v pins:4 pin:1.fc pin:2.mc pin:3.f pin:4.f
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