Typical current rating is 15A
There are also banana plug rated for 20A, 35A or 36A

Mini banana plugs (2 mm) are typically rated for 5A

https://www.muellerelectric.com/docs/Banana-Plugs.pdf

Banana Plugs are referred to as a male connector and commonly found in either 4mm (standard) or 2mm (miniature) pin plug sizes. Banana plugs are designed to connect into Banana Sockets (Jacks) which again are available in either 4mm (standard) or 2mm (miniature) socket sizes

The Banana plug features a unique contact tip. The cylindrical pin features ‘metal-leaves’ that bulge outward to create a strong contact in a socket. The leaves prevent the connection failing when it’s subject to movement or vibrations and offers more reliable testing. Banana Plugs are typically connected to wire by; screw, solder or crimp.

Banana plugs can be found in a range of colours, the most common being black and red. It’s common to see them follow the standard colour codes; 0 – Black, 1 – Brown, 2 – Red, 3 – Orange, 4 – Yellow, 5 – Green, 6 – Blue, 7 – Violet, 8 – Grey, 9 – White.

Banana Plug Sizes: 4mm Vs. 2mm

Banana plugs are typically available in two different sizes, standard and miniature. In Europe, a standard banana plug refers to a 4mm plug. Generally all standard Banana Plugs are compatible with all 4mm Banana Sockets (Jacks). A miniature or mini banana plug is a smaller design of the standard banana plug. Miniature Banana Plugs can vary in size between 3mm and 2mm

Banana Plug Protective Sleeve Types
Banana Plugs typically offer three different types of protective sleeve options; unshrouded, retractable shrouded and shrouded. Banana Plugs with a shrouded sleeve are often used in High Voltage applications for safety requirements.

Unshrouded Banana Test Plugs
Unshrouded banana plugs are also called unsheathed banana plugs. They feature a bare pin that is uninsulated and visible. The unshrouded banana plug is commonly used in lower voltage (30 – 70 VDC) electrical testing applications.

Retractable Sleeve Banana Test Plugs
A banana plug with a retractable sleeve has a spring-loaded shroud cover that slides out of the way when the pin is inserted into a shrouded or unshrouded banana socket or jack. The retractable shroud improves safety and is typically used in higher voltage applications.

Shrouded Banana Test Plugs
Shrouded banana plugs are also called sheathed banana plugs. They feature insulation (protective plastic sleeve) around the connector to avoid accidental contact with the metal plug in high voltage situations. Shrouded banana plugs are a common requirement for CAT II & IV (600-1000V) applications. Shrouded banana plug will only fit into shrouded banana sockets (jacks). Remain safe when electrical testing high voltages with shrouded banana plugs.

Complete Guide to Banana Test Sockets (Jacks)
https://www.warwickts.com/2144/Guide-To-Banana-Sockets

Banana Sockets (Jacks) are female electrical connectors that a Banana Plug inserts into to make a connection. Banana Sockets (Jacks) are commonly found in either 4mm (standard) or 2mm (miniature) socket sizes.

Standard Banana Socket (Jack) accepts either; unshrouded or retractable shrouded 4mm (standard) Banana plugs irrespective of the pin leaf number. However, a standard Banana Socket cannot accept a standard Shrouded Banana Plug.
Shrouded Banana Socket (Jack) accepts; shrouded, unshrouded and retractable shrouded 4mm (standard) Banana plugs irrespective of the pin leaf number.
Banana Sockets (Jacks) can be found in a range of colours, the most common being black and red. It is common to see them follow the standard colour codes; 0 – Black, 1 – Brown, 2 – Red, 3 – Orange, 4 – Yellow, 5 – Green, 6 – Blue, 7 – Violet, 8 – Grey, 9 – White.

Banana Sockets (Jacks) Sizes: 4mm and 2mm
Banana Sockets (Jacks) are usually available in two sizes, standard and miniature. In Europe, a standard banana socket refers to a 4mm socket. Generally all standard Banana Sockets are compatible with all 4mm Banana Plugs. A miniature or mini Banana Socket is a smaller version of the Standard Banana Socket.

Standard Banana Sockets are frequently found in; automotive diagnostic, industrial and electrical testing applications. Specific applications affect connector body type and preferred colour.

Banana Sockets (Jacks): Sleeve Types
Shrouded (Safety) Banana Test Sockets
Shrouded Banana Sockets (Jacks) are also referred to as Safety Banana Sockets. They feature insulation (protective plastic sleeve) around the connector to avoid accidental contact with the metal socket in high voltage situations. Standard (4mm) Safety Banana Sockets accept Standard (4mm) Banana Plugs.

Unshrouded (Uninsulated) Banana Sockets
Unshrouded Banana Sockets (Jacks) are also called uninsulated banana sockets. They feature a bare socket that is uninsulated and visible. The uninsulated banana socket is commonly used in lower voltage electrical testing applications.

Banana Sockets (Jacks) can have different types of connection terminals at the front end which enables the socket to connect to different electrical fixtures or circuits. Bindings Posts are one type of Banana Socket (Jack).

- Banana Sockets (Jacks) Conclusion
Banana Sockets (Jacks) are a common and important component in many electrical applications. Joining wires and leads to equipment correctly is invaluable for safety and performance. Be sure to choose the correct; size, sleeve type, terminal style and colour for your electrical application.

Banana Plugs are spring-loaded, single-wire electrical test connectors used for joining wire to electrical test equipment or electrical circuit boards. Banana connectors come in either, Banana Plugs (male) or Banana Sockets (female). This short article identifies the different sizes and different types of banana plugs, as well as offering guidance on what banana test plug connector suits your specific application.

A recently amended European safety standard effectively bans the “banana
plug” that is used to connect loudspeaker leads to an amplifier. This plug,
which takes the form of a springy metal pin, is small enough to fit into the
5.5-millimetre openings of a European mains socket. Anyone who plugs speaker
leads into the mains could receive a lethal electric shock (Technology, 6
January 1996, p 20).

The British Federation of Audio, which represents all the major hi-fi
manufacturers, has been working with A&R Cambridge, maker of Arcam hi-fi
equipment, on a plug and socket that complies with North American safety
standards as well as the new European standards. The BFA connector is a
6-millimetre metal cylinder sleeved in insulating plastic and secured on the end
of a cable. Speakers and amplifiers are fitted with plastic cylinders that
shroud a central metal pin. There are no bare metal parts and the plug is too
big to be pushed into a mains socket.

An added advantage of the new connectors is that no one can touch the wires
carrying audio current from the amplifier. On high-power systems this can be
strong enough to give a shock. They also solve another problem. If the bare
metal pins of a banana plug touch, they can short out the amplifier and damage
it. The sheathing on BFA plugs will prevent this happening.