Glow discharge zener diode.
Designed to directly stabilize voltage or create a reference voltage.
The design is glass, with a base (РШ5-1).
Durability of at least 1000 hours.
Weight 45 g.

Main technical characteristics of SG3S:
• Ignition voltage, V…… no more than 127
• Stabilization voltage, V…… 108
• Lowest stabilization current, mA…… 5
• Highest stabilization current, mA…… 40
• Change in stabilization voltage when changing current in the operating range, V ...... no more than 3.5