411A

Four-electrode inert-gas cold-cathode tube intended for relay service. Multiple electrodes provide controlled gas-discharge switching without a heater supply.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: UX4
Base pins: -
Nominal heater: -

Description

Four-electrode inert-gas-filled cold-cathode tube intended for relay service.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UX4
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

RelayControlSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Promoted fields mapped from printed maximum-rating and characteristic headings; additional published values preserved in parameter rows.

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

2026 Western Electric 400s

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Characteristic

Peak" Cathode Current
10 milliamperes
Peak" Cathode Current 10 milliamperes
Ambient Temperature Limits*!.'!!'.'!'*!"" VA ^
52 second
Ambient Temperature Limits*!.'!!'.'!'*!"" VA ^ 52 cyc'«s/second

Other

Maximum Peak Inverse Current
2 seconds
Maximum Peak Inverse Current 2 seconds