Product Overview
Cal Test CT2989-0 Sheathed 4mm Banana Plug - 1000V CAT III, Dual Allen Screw, Made in France
Condition
Unused NOS. Clean and pristine - no marks, no wear. Inspected and ready to deploy. Sourced from a government research facility. Photos show the specific unit you will receive.
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Product Overview
Cal Test Electronics CT2989-0 is a 4mm sheathed in-line banana plug in black, made in France. It terminates without soldering - strip the wire, insert it into the barrel, and lock it down with two Allen-head set screws using a 1.5 mm hex key. The lantern-style spring contact and insulated tip are built for custom test leads, patch cords, and high-voltage interconnects where field assembly and CAT III safety compliance both matter.
Key Features
- Connector type: 4mm banana plug (male), fully sheathed and insulated
- Voltage rating: 1,000V CAT III
- Current rating: 36A continuous
- Wire accommodation: up to 12 AWG conductor (2.5 mm max conductor diameter)
- Insulation clearance: accepts wire jackets up to 4.0 mm O.D.
- Connection method: solderless dual Allen-head set screws (1.5 mm hex key)
- Contact style: lantern spring with insulated tip
- Contact material: brass and beryllium copper, nickel-plated
- Insulation material: polypropylene
- Temperature range: -20°C to +80°C
- Color: black
- CE marked; made in France
Applications
- Building custom test leads for a bench multimeter or power supply - strip, insert, tighten two screws, done in under two minutes with no iron in hand
- Replacing a damaged plug on an existing lead without scrapping the whole cable
- Wiring load bank connections where a 36A-rated, CAT III-safe plug keeps the setup inside compliance
- Maker and lab bench builds where a sheathed plug is needed on a high-current DC line and soldering is impractical
- Stocking a service kit with spare plugs for field repair of test equipment leads
Frequently Asked Questions
Will this plug fit standard banana jack panels and binding posts?
Yes. The 4mm banana plug is the global standard for test and measurement binding posts - it mates with any standard 4mm banana jack on multimeters, power supplies, load banks, and lab instruments.
Does assembly require soldering?
No. The CT2989-0 is fully solderless. Insert the stripped conductor into the barrel and tighten both set screws with a 1.5 mm hex key. The dual-screw design locks both the conductor and the wire jacket independently.
What is the minimum wire size this plug accepts?
The plug is designed for conductors up to 12 AWG (2.5 mm max conductor diameter) and wire jackets up to 4.0 mm O.D. Minimum wire size is not specified, but the dual-screw termination works reliably across a practical range of wire sizes used with 12 AWG and smaller conductors.
Is a hex key included?
Not included. Assembly requires a 1.5 mm Allen hex key, which is a standard bench tool.
A French-made banana plug that does not ask you to find a soldering iron at the wrong moment - twin Allen screws, a lantern spring contact, and 1,000V CAT III clearance. Strip it, seat it, tighten it, and move on to the measurement that actually matters.
