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Specialized - Ignitron ·IgnitronPowerSwitch

NL5550

Mercury-pool ignitron power switch for industrial welding, rectifier, or high-current control service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
-

Description

NL5550 water-cooled or industrial mercury-pool ignitron for welding/control service.

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

IgnitronPowerSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Mercury-pool ignitron AC-control/rectifier section.

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

1957 National Electronics

Published operating points and test conditions from this source.

SECTION 1

IgnitronPowerSwitch

Other

  • AC control frequency minimum

    25 Hz

  • AC control frequency maximum

    60 Hz

  • Peak forward voltage

    6000 V

    CapacitorDischarge

  • Peak inverse voltage

    3000 V

    CapacitorDischarge

  • Peak anode current

    500 A

    CapacitorDischarge