Ref.: $102/1G Thermal Delay Switches Codes: $102/1G VLS631 $102/1K These miniature thermal delay switches have been designed to provide delay between the application of heater voltage and anode voltage in indirectly heated valves and mercury vapour rectifiers. The $102/1G is identical to the VLS631 but has a B7G/F base for wiring directly into the circuit. HEATER Heater voltage 6.3 v Nominal current 0.5 A DELAY TIME AT 20C Minimum delay 44 sec Maximum delay 66 sec DIMENSIONS $102/1G VLS631 Maximum overall length 54.0 mm Maximum seated height 47.6 47.6 mm Maximum overall diameter 19.4 19.1 mm Minimum lead length 38 mm< Base B7G/F B7G Net weight 9 9 g Mounting position Vertical, base down <_ MAXIMUM RATINGS Maximum open circuit D.C. voltage between contacts 220 v Maximum contact current on make 1.0 A Maximum surge current on make 5.0 A Maximum current on break at 50 V D.C. 100 mA NOTE.A recommended method of operation is to arrange for the delay switch to operate a mechanical relay fitted with a thold-on coil. By this means large powers can be handled and it can be so arranged that as the contacts close the heater supply of the switch is removed. This will ensure the full delay time in the event of a shut down. Delay switches may be connected in series to obtain multiples of the quoted delay time. $102/1G = February 1957 $102/1K 1957 Standard Telephones and Cables LimitedRef.: S102/1G Thermal Delay Switch $102/1K ermal Delay Switches Codes: $102/1G VLS631 VLS 631 TYPICAL CURVE SHOWING RELATIONSHIP BETWEEN HEATER VL3090-!| VOLTAGE AND DELAY TIME. 20 MEASUREMENTS TAKEN AT CONSTANT HEATER VOLTAGE AND ROO (seconds) DELAY TIME 55 60 65 70 75 HEATER VOLTAGE CV) 3 40 4s 50 S102/1GY._> February 1957 $102/1KThermal Delay Switches Ref.: $102/1G $102/1K Codes: $102/1G VLS631 * OENOTES :- MEASURED FROM BASE SEAT TO BULB TOP LINE AS DETERMINED BY RING GAUGE OF E INT: DIA: $102/1G P B= } E f+ ~~] 1 | A BASING C# 1 HEATER 2 16. 3 ACTIVE STRIP 4 STATIONARY STRIP 5 N.C, J 6 1., a 7 HEATER B7G/F | BASE ~ D DIM MILLIMETRES INCHES A | 476 MAX: 1% MAX: B | 191 MAX: g@ MAX: ce | 361 42-4 kt D | 380 MIN: 1y MIN: < ee Ton % February 1957 NOTE: BASIC FIGURES ARE INCHES. $102/1G 3 $102/1K fRef.: $102/1G Th . ermal Delay Switches $102/1K Y Codes: $102/1G VLS631 VLS631 RING GAUGE A L BASING Fe | HEATER 2 4e. 3 ACTIVE STRIP 4 STATIONARY STRIP 5 N.C. 6 LC. \ / 7 HEATER \,. BASE # DENOTES:- MEASURED FROM BASE SEAT TO BULB TOP LINE,AS DETERMINED BY RING GAUGE OF 'E' INT: DIA. A MAX. MAK TF 40 47-6 MAX NOTE BASIC FIGURES ARE INCHES. S102/1G February 1957 s102/1K f4