UA12U

Inert-gas surge arrester designed to protect aerial lines and cables against lightning and atmospheric overvoltages by conducting when transient voltage exceeds its protective threshold.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

Inert-gas-filled surge arrester for protecting aerial lines and cables against lightning and atmospheric overvoltages.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

SurgeProtector

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published electrical characteristics preserved in parameter rows; regulator-specific fields promoted where applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 Cerberus

Published operating points and test conditions from this source.

SECTION 1

SurgeProtector

Other

Static breakdown voltage
220 to 270 V
Dynamic breakdown voltage
- to 800 V
Pulse 2 kV - 1/50
AC shunting current
20 A
1 s, 50 Hz
Surge current
10 kA
Pulse 15/50

Characteristics

Glow sustaining voltage
115 V
Arc sustaining voltage
25 V

Capacitance

Capacitance
4 pF