UA350U

Inert-gas surge arrester family for protecting telecommunication and signalling systems against lightning, earth-return, and other transient overvoltages.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Inert-gas surge arrester family for protecting telecommunication and signalling systems against lightning and earth-return 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
315 to 385 V
Dynamic breakdown voltage
- to 1000 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
130 V
Arc sustaining voltage
25 V

Capacitance

Capacitance
4 pF