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DLS10Sensibly equivalent¶ to:
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The DLS10 thermal delay switch very clearly shows the construction of the switch elements. The bi-metallic strip is heated by the filament (4 V) and at the correct temperature, and pre-set time (about 15 s), the switch contacts make and power can be applied to the protected device. Normally a mercury vapour rectifier.The 4 Volt heater suggests a 1930's origin of this design.The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 94 mm tall.Reference: Data-sheet. |
Pin Connections
| 1 | 2 | 3 | 4 |  fc | mc | h | h |
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Absolute Maximum Operating Conditions¶
Delay | Vh | Ah | Va | mAa | 
| 4.0 | 1.5 | 250 | 6,000 |
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PDF scanned from an original document held by the museum |
Updated June 09, 2020.
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