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Electric wedge connectors / clamps

Electric wedge connectors are used in power utility industry, particularly for aerial lines with voltages less than 220KV.

“C-spring" & wedge design. 
Easy install, no need shotgun. Position plate design ensures the optimized grip force.
Lock pin design with exclusive patent prevents wedge from loose. 
Other connectors: 1 model to 1 diameter of wire
VVMA connectors: 1 model to N diameters
Because VVMA connector has a very special design: the wedge block is longer than C-type component, which allows users to adjust different positionings between the wedge block and the C-type component (this is based on the diameter of wire and assistance by stress positioning plate). One size of VVMA connector may be applied to multi diameters of wire combinations, and may hold constant optimum grip force. VVMA only use 25 models to meet more than 200 cables with different diameters from AWG #5 to 1192.5 Kcmil, which greatly reduce the demands of inventory.


Wedge connector / clamp is merely a small product, but playing a significant role in power utility industry. Premium wedge connectors shall guarantee continuing, long-term and reliable operations for the power conveying system. Bad connectors may lead to various damages to the system.

Design of the wedge connectors / clamps should be based on the characteristics of the metallic conductor, and some other factors such as the temperature changing of the wire and environment, anti-corruption and anti-oxidation of the metal material, connecting method and dimensions of the wire should also be taken into comprehensive consideration.

Our premium wedge connectors / clamps solve the following issues:

Contact surface: good contact of the connector and wire can reduce the contacting resistance and avoid the over-heat which may produce the carbon stacking and even the fusing.

  electric wedge connectors

Materials matching: materials of wire and wedge connectors / clamps are the same, mainly consist of aluminum or copper. PD(potential difference) and electrochemical corrosion can be avoided by materials matching which ensures simultaneous thermal expansion and contraction. 

Thermal expansion and contraction: Changes of current and ambient temperature make metals continually repeat activities of thermal expansion and contraction, whereas a good connector must overcome this change, keep constant pressure attached to wires and hold consistent contact surface.


Anti-oxygenation and anti-corrosive property: Both conductor and connectors / clamps may be oxidized due to temperature rise, which may reduce the contact area and increase resistance.


Installation and storage: Easy install, low demands of storage.

                                          Wedge connectors / clamps easy install, no need shotgun


VVMA self-locking wedge connectors / clamp consist of C-spring component, which is made of top-quality aluminum alloys and wedge block with exclusive patent technology, extensively applied to connections between aluminum and steel-cored stranded conductors,  and connections between aluminum and copper stranded wires. 

VVMA self-lock wedge connector / clamp is developed by American and Chinese local experts. It can not only guarantee the safe and reliable operation, but also maximally reduce the number of models in use because of wider range of wire sizes that single wedge connector can be applied to.

Elastic C-type component:

Special material formula (patent) and processing techniques bring VVMA C-type component a good elasticity, combining the design of wedge pressure technology, a Coordinated  Breathe connecting system is created, which effectively eliminates the phenomenon of burning clamps resulted from thermal expansion and contraction or bad contact.

Easy install:

Tap by hammer without shotgun, it is the fastest installation method in comparison with others, also according with mounting habits of workers. Exact grip force can be ensured by observing the position of the red plate on the wedge connector. When the red positioning plate falls from front to behind, stop tapping.

Especially under the hot-line working environment, workers contact time with electrified conductor will be reduced dramatically, which greatly improves the safety of workers.

                      Wedge connector / clamp before install, and install completed


Simple optimum grip strength determination:

There is a very simple method to determine optimum grip strength in mounting VVMA Connectors, that is to utilize stress positioning slice: before mounting, the stress positioning slice lies in the semi-circle slot of C-type component; after mounting, the opening of C-type component becomes bigger, then the stress positioning slice drops into the semi-circle slot of the C-type component because of the stress change.

The principle of VVMA clamps design for optimum strip strength is based on the changing relationship between the strip strength of VVMA Clamps C-type component and the clamps contact resistance, involving grip point A, which will hold best contact resistance and at the same time has sufficient elastic cushion.

Autolocking design: VVMA Clamp has a lock pin in C-type component and lock slot in wedge block, which may automatically form a self-locking mechanism when mounting.

When dismounting, screwing control screw in clockwise may lift up lock pin and in this way will realize the goal of repeat applying.

Increase adaptability for conductors & reduce inventory: VVMA clamp has a very special design: the wedge block is longer than C-type component, which allows users to adjust different positioning between the wedge block and the C-type component (this is based on the diameter of wire and assistance by stress positioning slice, confirm when mounting). One size of VVMA clamps may be applied to multi kinds of wire combinations, and at the same time may hold constant optimum strip strength. VVMA only use 25 sizes of clamps to meet a wide range of wires from LJ16 to LJ300, which greatly reduce the demands of inventory.

Install & Uninstall

Wedge connectors / clamps Installation

1  Connector selection

Choose appropriate connector per the wire sizes

2  Fix clamp

Unscrewing stress positioning slice, reference to the cardinal line mark of on the wedge block, ( no marking branch), put the branch line for connecting on the bottom slot of the C-type component, then hang the C-type component and branch line together on the cardinal line.

Insert the wedge block between the two conductors, tap and fix the wedge lock.  

3  Install clamp

Rolling the positioning slice to the semi-circle slot on the opposite of C-type component and fixing its position, knocking on the wedge block, and along with the wedge block tapping in, the C-type component will gradually produce elastic deformation, and keep tapping in till the stress positioning slice falling into the semi-circle slot. At the same time, the lock pin on the wedge block will automatically clip into the C-type lock slot, the wedge block will then be fixed. 

After completing installation, the C-type may stretch out in a small degree and produce elastic effect, which will hold a constant contact pressure with conductors. 


Utilizing the lock pin on the wedge block to control the screw and rolling clockwise will lift up the lock pin, then knocking on wedge block in reverse will drop out the wedge block.


Downdload P/N Selection Chart


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