The product shown is a standard 4 mm male banana plug, commonly used for test leads, laboratory equipment, power supplies, electrical trainers and measurement instruments. The exact electrical rating varies by manufacturer and construction, so the following is a typical catalogue specification for this style. Comparable 4 mm plugs are commonly rated around 10–30 A and 30–60 V, depending on the model. Product Specification Parameter Specification Product Name 4 mm Banana Plug Product Type Male Banana Plug Connector Size 4 mm Gender Male Contact / Pin Diameter 4.0 mm Connection Type Cable Mount Termination Screw / Solder type, depending on variant Contact Material Brass / Copper Alloy Contact Plating Nickel Plated Spring Contact Yes Insulation Material PVC / ABS / Acetal, depending on variant Body Material Insulated moulded plastic Rated Current Typically 10–30 A Rated Voltage Typically 30 VAC / 60 VDC for standard versions Contact Resistance ≤10 mΩ typical Cable Compatibility Up to approximately 2.5–4 mm conductor/cable, depending on termination Operating Temperature Approximately −20°C to +110°C, depending on material Mounting Cable Mount Colour Options Red, Black, Green, Yellow, Blue Application Test & Measurement / Electrical Connection Mating Socket Standard 4 mm Banana Socket RoHS Available in RoHS-compliant versions For example, a standard 4 mm screw-on model specifies 10 A, 30 VAC/60 VDC, nickel-plated brass contacts, spring contact and up to 2.5 mm² conductor capacity. A different RS PRO 4 mm model is specified at 24 A maximum, 30 VAC/60 VDC and 39 mm nominal length, demonstrating why the exact model should be confirmed before printing a rating on a catalogue. Mechanical Dimensions — Typical Dimension Typical Value Pin Diameter 4 mm Overall Length Approx. 39–65 mm Body Diameter Approx. 8–12 mm Cable Entry Approx. 2.5–4 mm Plug Type Straight Stackable Available in stackable versions Some commercial 4 mm plugs are approximately 39 mm long, while heavier-duty models can be around 65 mm, so the exact dimensions depend on the construction. Features Standard 4 mm banana plug Spring-loaded contact for reliable mating Nickel-plated contact for corrosion resistance Insulated body for safer handling Colour-coded body for polarity identification Suitable for flexible test leads Compatible with standard 4 mm banana sockets Available as screw, solder, clamp or push-lock termination Stackable versions available Suitable for electrical test and measurement applications Typical Applications Laboratory power supplies Multimeters and test equipment Electrical trainer kits Test and measurement instruments Battery testing Power supply connections Control panels Audio/electronic equipment Prototype and development equipment Industrial electrical testing Colour Identification Red – Positive (+) Black – Negative (−) / Common Green – Earth / Ground Yellow – Auxiliary / identification Blue – Negative / auxiliary Catalogue-Ready Specification 4MM BANANA PLUG Type: Standard Male Banana Plug Size: 4 mm Pin Diameter: 4.0 mm Contact: Brass/Copper Alloy, Nickel Plated Spring: Spring Contact Body: Insulated PVC/ABS/Acetal Termination: Screw/Solder Type Current Rating: 10–30 A* Voltage Rating: 30 VAC / 60 VDC* Contact Resistance: ≤10 mΩ* Cable Size: Up to 2.5–4 mm²* Temperature: Approx. −20°C to +110°C* Colours: Red / Black / Green / Yellow / Blue Mounting: Cable Mount Mating: 4 mm Banana Socket Applications: Test Leads, Laboratory Equipment, Power Supplies, Electrical Trainers & Test Instruments. * Rating and dimensions must be confirmed against the exact manufacturer/model, because 4 mm banana plugs are available in substantially different electrical ratings. For example, specialist versions can be rated as high as 30 A / 750 V, while ordinary versions have much lower ratings.
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