Product Overview
Cal Test CT2989-2 Red 4mm Banana Plug - 1000V CAT III, Dual Set-Screw, Solderless Field Assembly
Condition
Unused NOS. Inspected and ready to deploy. Three-piece assembly present: red polypropylene boot, ribbed red body with CE marking, and nickel-plated pin with dual Allen-head set screws. Sourced from a government research facility. Made in France.
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Product Overview
Cal Test Electronics CT2989-2 - a 4mm in-line sheathed banana plug built for DIY test lead assembly in professional and lab environments. Solderless dual set-screw termination accepts up to 12 AWG wire, secured with a 1.5mm hex wrench. No soldering required. Fully insulated polypropylene housing with a non-conductive tip meets 1000V CAT III safety requirements.
Key Features
- Connector type: 4mm banana plug (male), fully sheathed
- Color: Red - industry standard for positive or hot line identification
- Termination: solderless dual Allen-head set screws - secures both conductor and insulation jacket
- Contact style: lantern spring with non-conductive insulated tip
- Contact material: nickel-plated brass and beryllium copper
- Insulation material: polypropylene (PP)
- Voltage rating: 1000V CAT III
- Current rating: 36A continuous
- Wire accommodation: up to 12 AWG (max 2.5mm conductor diameter)
- Insulation clearance: accepts wire jacket up to 4.0mm O.D.
- Temperature range: -20°C to +80°C
- Assembly tool required: 1.5mm hex wrench
- CE marked; made in France
Applications
- Lab technician builds a custom differential measurement lead for an oscilloscope - strips 12 AWG wire, drops the conductor into the barrel, tightens both set screws with a hex key, snaps the housing together, done in under two minutes without a soldering iron
- Repair shop tech replaces a damaged connector on an existing power supply test lead before a calibration session - no rework station needed, just the plug and a hex wrench
- Engineer wiring up a load bank test harness routes 36A-rated leads through a panel and terminates each positive line with a red CT2989-2 for immediate polarity identification at the binding post
- Maker or home lab builder assembles a set of bench power supply leads with matched red and black plugs, giving their setup a clean, professional connection that takes real current without melting
- Electronics student or hobbyist building a first set of multimeter leads from scratch - the solderless screw design means no special skills needed, just measure, strip, and tighten
Frequently Asked Questions
What tool do I need to assemble this plug?
A 1.5mm hex (Allen) wrench. One screw clamps the bare conductor; the other grips the wire insulation jacket for strain relief.
Will this fit standard banana jacks on my multimeter, power supply, or oscilloscope?
Yes. The CT2989-2 is a standard 4mm banana plug and mates with any 4mm banana jack or binding post.
What is the maximum wire size this plug accepts?
Up to 12 AWG (2.5mm maximum conductor diameter). The insulation clearance accepts wire jackets up to 4.0mm O.D.
Is the 1000V CAT III rating for the plug alone?
The plug itself is rated 1000V CAT III. The assembled lead's overall rating depends on the wire used - the wire must meet an equivalent rating for the full assembly to carry that designation.
Is a solder version available, or is this screw-only?
This is the screw-termination version. Cal Test offers a solder-termination variant (CT2989-S-2) as a separate part number.
A French-made banana plug with a beryllium copper spring and dual set screws is a small thing - until you're staring at a dead connection on a 36-amp load test and wishing you'd built it right the first time. This one's already inspected and ready to go.
