MELTRIC High Ampacity plugs and receptacles provide safe, reliable, easy-to-operate electrical connections for large heavy-duty equipment. Whether it's shore power, mining equipment, generators, pumps, power distribution, test stations, or other high amperage applications, we have the connections you need to keep your operations running.
Superior Electrical Performance
Better contact technology and materials provide high conductivity connections that hold up in harsh conditions. More…
Like all MELTRIC devices, our High Amperage devices are designed with the first priority of keeping users safe, even in abnormal conditions. More…
Ease of Operation
Draw mechanisms and other design features make MELTRIC High Amperage devices much easier to connect and disconnect than most competitive devices. More…
Lead times on competitive 3-phase high amperage devices can be eight or more weeks. Most MELTRIC orders ship within just a few days. More…
All MELTRIC high amperage devices achieve their rated watertightness automatically simply by connecting the plug and receptacle. More…
High amperage devices don’t need to be huge. The MELTRIC DR400 packs 400A into a relatively small mounting footprint. More…
DR400s have a screw-locking pawl that can be used to lock the plug and receptacle together to prevent accidental disconnections that could be made without proper thought and following of proper deenergization procedures. A lockout hole is also provided for the added security of padlocking the plug and receptacle together or locking the lid in the closed position for lockout-tagout.
DR400s are equipped with two pilot contacts that can be used to control the power circuit. In the event of unintended disconnection under load, this at least ensures that the circuit is deenergized as the plug is ejected to the rest position. The circuit will be off before the user can remove the plug.
While the power circuit and receptacle should be deenergized anytime the plug is not connected, things can go wrong. To provide additional safety in those circumstances, the DR400 has a safety shutter that blocks access to the receptacle contacts. The shutter opens during the connection of the plug and automatically closes before it can be removed.
Standard drawbar mechanism makes connecting a DR400 easy, even in inline applications with large cables. The drawbar easily pulls the plug into the receptacle and securely latches it in place.
Push Button Release
Once the circuit is deenergized, the drawbars are disengaged, and the pawl is unlocked, the DR400 can be removed from the receptacle simply by depressing the pawl. This releases the spring-loaded ejection system and automatically ejects the plug to the rest position. It can then be removed by rotating it 30° counterclockwise and withdrawing it.
Easy connection, easy disconnection. The struggling required with 400A pin and sleeve devices is eliminated.
DR400 plugs and receptacles achieve their standard IP69 environmental protection simply by connecting the plug and receptacle. There is no need to thread on or turn special rings as is required to engage ingress protection as on some other devices.
DR400s use heavy-duty spring-loaded silver-nickel butt contacts to provide consistent high-performance electrical connections and long operating lives.
The spring-loading and end-to-end mating of the contacts ensures that optimal contact force is maintained over thousands of operations and eliminates the impacts of sliding wear that inherently degrades pin and sleeve contacts over time.
The solid 85% Silver/15% Nickel contacts provide much higher conductivity/lower resistance connections than brass contacts and that conductivity does not degrade with oxidation and exposure to the elements the way it does on brass contacts.
MELTRIC stands behind its electrical contacts with a 5-year warranty.
Like all high amperage plugs and receptacles, 300-600A PF and PFQ devices are not intended to be connected or disconnected under load. To help prevent that possibility, the devices are equipped with pilot contacts to control the power circuit and a mechanical interlock that ensures that the pilot circuit is not completed until after the plug and receptacle are properly connected.
Rotation of the locking cam secures the plug to the receptacle and completes the pilot circuit allowing power to flow. The rotation of the plug required for disconnection is blocked by the locking cam.
The process is reversed for disconnection. The locking cam must first be rotated back to the open/unlocked position. This breaks the pilot circuit and shuts down the power circuit (if it has not already been deenergized). The plug can now safely be disconnected from the receptacle by rotating it 30° counterclockwise and withdrawing it.
While the power circuit and receptacle should be deenergized anytime the plug is not connected, things can go wrong. To provide additional safety in those circumstances, PF/PFQ devices have a safety shutter that blocks access to the receptacle contacts. The shutter opens during the connection of the plug and receptacle contacts and automatically closes before the plug can be removed.
The plug inserts easily into the receptacle in a rest position in which the contacts are not yet engaged. Mating of the plug and receptacle contacts is accomplished by rotating the plug approximately 30° clockwise. The design of the handle provides significant leverage for rotating the plug and the shape of the contacts provides a ramp effect to facilitate engagement. This makes the connection far easier than a large pin and sleeve device.
PF/PFQ plugs and receptacles achieve their IP66/IP67 environmental protection simply by connecting the plug and receptacle. Proper connection/watertightness is verified by the user’s actuation of the locking cam.
Spring-Loaded Silver Contacts
PF and PFQ devices have solid silver contact surfaces for maximum conductivity. Silver is an excellent conductor and, unlike brass or copper, its performance doesn’t significantly degrade with oxidation or in high humidity environments. The contacts meet tip-to-tip and the pressure applied by the spring-loading ensures optimal contact force and compensates for wear from repetitive usage.
SP devices are equipped with an interlock system that requires the plug to be inserted and latched in place before the twist ring can be rotated to the ON position to complete the pilot circuit controlling the power. While the device is in the ON position, the latch release is disabled so the plug remains locked into the receptacle and cannot be removed.
In order for the plug to be removed, the twist ring must first be rotated back to the OFF position, breaking the pilot circuit and thus deenergizing the power circuit. The plug can then safely be removed by depressing the latch release button and withdrawing it from the receptacle.
Finger Safe Receptacle Contacts
If the device’s pilot contacts are properly wired to control the power circuit, the receptacle should be de-nergized anytime the plug is not securely latched in place. To provide additional safety in case of abnormal circumstance, the receptacle is also designed to be finger safe. The contact is recessed in the receptacle and the openings are too small for fingers to access.
The phase 1, phase 2, phase 3, ground and neutral devices are all mechanically keyed in a different manner to prevent improper connection between phases or other contacts. The devices are also color coded to make identification of the phases easy.
Drawbars for Easy Connection
Standard drawbar mechanism makes connecting an SP simple, even with large cables. The drawbar easily pulls the plug into the receptacle and securely latches it in place.
Silver Contact Material
SP devices have solid silver butt style contacts to provide connections that maintain their high conductivity/low resistance over the life of the device. Their design eliminates problems due to the wear and increasing resistance that are inherent with the brass sliding contacts used in many other single pole devices. The SP’s silver contacts provide better power quality and less power loss due to high resistance/heat generation.
Locking Pin to Prevent Unintended Disconnection Under Load
CS1000 devices are equipped with a locking pin that automatically engages when the plug and receptacle are connected. It blocks the rotation of the device necessary to disconnect the plug, and thus helps to ensure against improper disconnection.
A special tool is provided to retract the pin, making absent-minded disconnection under load unlikely. For added security, an optional padlocking accessory is available and can be used for locking the plug and receptacle in the connected position by preventing the pin from being retracted.
Finger Safe Receptacle Contacts
The power to the receptacle should be off during connection and disconnection and anytime the plug and receptacle are disconnected. For additional safety, CS1000 receptacles are provided with a fingerguard to block unintended access to the receptacle contact.
Mechanical Keying and Color Coding to Prevent Intermating of Phases
The phase 1, phase 2, phase 3, ground and neutral devices are all mechanically keyed in a different position to prevent improper connection between phases or other contacts. The devices are also color coded to make identification of the phases easy.
Spring-Loaded Silver-Nickel Butt Contacts
CS1000s use heavy-duty spring-loaded silver-nickel butt contacts to provide consistent high-performance electrical connections and long operating lives.
The spring loading and end-to-end mating of the contacts ensures that optimal contact force is maintained over thousands of operations and eliminates the impacts of sliding wear that inherently degrades pin & sleeve contacts over time.
The solid 85% Silver/15% Nickel contacts provide much higher conductivity/lower resistance connections than brass contacts and their conductivity does not degrade with oxidation and exposure to the elements the way brass contacts do.
MELTRIC stands behind its electrical contacts with a 5-year warranty.