Specialized - Switching Tube ·ThermalDelaySwitch
Miniature thermal-delay switch designed to delay application of anode voltage to indirectly heated valves and mercury-vapor rectifiers, with a specified delay around 44–66 seconds at room temperature.
The STC/BRIMAR VLS631 is a miniature thermal delay switch that delays application of anode voltage to indirectly heated valves and mercury-vapour rectifiers; its specified delay is 44–66 seconds at 20 °C.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Special-valve ratings and characteristics retained as parameters where applicable.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Nominal delay minimum
50 s
20C
Nominal delay maximum
60 s
20C
Delay minimum over ambient range
50 s
-35Cto85C
Delay maximum over ambient range
90 s
-35Cto85C
Maximum open-contact voltage
220 VDC
Maximum make current
1 A
Maximum surge current on make
5 A
Maximum break current
100 mA
50VDC
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Nominal Heater Current
500 mA
Minimum Delay Time
44 s
AmbientTemperature=20C
Maximum Delay Time
66 s
AmbientTemperature=20C
Maximum Open-Circuit DC Contact Voltage
220 V
Maximum Contact Current on Make
1 A
Maximum Surge Current on Make
5 A
Maximum Break Current
100 mA
DCVoltage=50V