K-LOK 400A Single-Pole Cam-Type Connectors
K-LOK 400A single-pole cam-type connectors are engineered for high-current temporary power applications where speed and reliability matter. Rated up to 400A maximum at 600V AC / 250V DC maximum, the family uses high-conductivity brass contacts and a Santoprene (thermoplastic vulcanizate / TPV) body compound rated to 105°C. A non-metallic retaining screw in POM (polyoxymethylene) passes through the full contact to lock it firmly in place, eliminating accidental current paths. Molded alignment arrows, cable cut-off reference lines, and ribbed grip geometry support fast, consistent field terminations across crews. K-LOK 400A covers inline, panel mount, and receptacle configurations, intermateable with compatible cam-type connectors from other major manufacturers. UL Listed, UL File Number E332947.
Safety note: K-LOK single-pole connectors are not rated for load-break disconnection. De-energize the circuit before mating or unmating. K-LOK 400A is not intended for use with motor loads.
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Find Your Configuration
K-LOK 400A connectors are available in three mounting formats. Select your format below, then choose male or female and your phase-identification color. All 9 colors are available across all configurations.
Add your color suffix to the base SKU to get the full part number. Example: KL-400LF + Blue (B) = KL-400LFB. See the color table below.
Phase Identification Colors
All 9 phase-identification colors are available across every configuration. Select the color that matches your phase convention or fleet standard.
International Phase Color Convention
Select the connector color that matches the phase convention for your region and system voltage.
Built for the Field
| Feature | Why It Matters in the Field |
|---|---|
| Non-metallic retaining screw (POM) | Passes through the full contact, locking it firmly in position and eliminating accidental current paths. POM is non-conductive and corrosion-resistant, with no metallic failure modes in wet or high-humidity environments. |
| Molded alignment arrow | Shows the correct mating orientation at a glance, which helps in high-pressure, low-light event environments where mistakes are costly. |
| Cable cut-off reference line | Molded into the body to give every technician a consistent cable preparation reference. Reduces variability across crews and speeds up termination on large cable pulls. |
| Ribbed grip geometry | Body profile is optimized for secure one-handed operation in wet, gloved, or high-vibration conditions. Santoprene TPV retains flexibility across temperature extremes. |
| Custom cable-access hole diameters | Standard hole is 16.90 mm. Medium (14.60 mm) and small (10.40 mm) options available on request. Accommodates mixed cable builds without adapter workarounds, a meaningful advantage for integrators specifying across multiple cable gauges. |
Dimensions
All configurations accept cable from #6 AWG to 4/0 AWG (cable access range 0.33" to 1"). A longer set screw is required for #6 AWG and #4 AWG conductors.
Ø31 mm (F)
Ø95 mm flange (F)
Add color suffix to base SKU for the full part number (e.g., KL-400LFB = Blue Inline Female). 9 colors available per configuration. Contact KUPO for dimensional drawing files (DXF/DWG).
Accessories and Spare Parts
| Part Number | Description | Notes |
|---|---|---|
| KL-400-BS | Retaining screw, 400A K-LOK | POM (polyoxymethylene), non-metallic. Replacement retaining screw for all K-LOK 400A connectors. Inspect at each re-termination; replace if you see any deformation, cracking, or thread wear. |
Additional accessories including protective caps and dust covers are available. Contact KUPO for current part numbers and availability.
Certifications and Compliance
| Certification / Standard | Detail |
|---|---|
| UL Listed | Listed by UL for the United States under File Number E332947 (UL 1691, rain tested to UL 50E), evaluated with 4/0 AWG copper conductors. The current listing does not cover Canada. |
| UL 1691 | Standard for Single Pole Locking-Type Separable Connectors. The applicable product safety standard for this connector family in North America. |
| Environment Rating | UL Enclosure Type 3R (when mated). Rated for outdoor use with protection against rain, sleet, and external ice formation. |
| Flame Class | HB per UL94. Horizontal burning classification for the Santoprene TPV body compound. |
| RoHS | Compliant with RoHS (Restriction of Hazardous Substances) Directive. No restricted materials in the contact, body, or retaining hardware. |
| SCCR / Ambient Temp. | Short-Circuit Current Rating (SCCR) and minimum ambient temperature range: contact KUPO Engineering for project-specific documentation. |
For project submittal packages, compliance documentation, or application-specific engineering questions: contact KUPO Engineering.
Specs, Drawings, and CAD
Download the documents you need to complete a submittal package, mechanical design check, or procurement specification.
| Document | Format | Download |
|---|---|---|
| Product Family Datasheet | Download | |
| Full Catalog Extract | Download | |
| Installation and Termination Guide | Download | |
| 2D Drawings (DXF / DWG) | ZIP | Download |
| 3D CAD Models (STEP / IGES) | ZIP | Download |
| Panel Cutout Template | DXF | Download |
| Compliance Pack (UL, RoHS) | ZIP | Download |
| Cross-Compatibility Statement | Download |
Need a document not listed here? Contact us and we will prepare it for your submittal package.
Installation and Wiring Guidance
K-LOK 400A requires no special tools for field assembly and disassembly. Follow the steps below for the correct termination procedure. Inline and panel mount installations use different processes.
Power Flow Direction
Before mating any K-LOK 400A connectors, confirm the direction of power flow. Feed power through the female side: female receptacles and female line connectors face the source, and male connectors and inlets face the load. This keeps live contacts recessed whenever a connection is open.
Female (source side) mates with male (load side).
Inline Connector Installation (10 Steps)
- Measure the cable jacket diameter and compare with the connector body.
- Cut the cable jacket at the groove that matches the jacket diameter.
- Measure a strip gauge of 1-3/8” (35 mm) and push the cable through the boot, exposing 6” of conductor.
- Wrap strain relief wire around the cable jacket 1/4” to 3/8” from the end; twist tightly 2 to 4 times.
- Squeeze wire ends together and bend them parallel to the cable. Trim any stray wire flush with the cable.
- Wrap copper shim tightly around the conductor strand and strain relief wire.
- Insert the wire bundle into the brass contact as far as possible.
- Tighten the set screws using a hex wrench. (For the set-screw torque value, see the Installation and Termination Guide or contact KUPO Engineering.)
- Pull the boot cover over the contact.
- Align the positioning hole and tighten with the retaining screw (KL-400-BS).
A longer set screw is required when terminating #6 AWG or #4 AWG conductors. Contact KUPO for the correct set screw length.
Threaded Stud Panel Mount Receptacle Installation (4 Steps)
- Remove the M12 nut and washer from the threaded post on the connector body.
- Screw the connector onto the panel through the panel cutout.
- Fit the terminal over the threaded post from the rear of the panel.
- Refit the washer and nut onto the threaded post. Tighten to a maximum of 12 N·m. Do not exceed this torque value.
Use the panel cutout template (available in the Downloads section above) to prepare panel holes for KL-400SM and KL-400SF. Outer diameter: Ø37.3 to 37.5 mm.
Frequently Asked Questions
Can I disconnect a K-LOK connector while the circuit is live?
No. K-LOK single-pole connectors are not rated for load-break disconnection. Pulling a K-LOK connector while current is flowing can create an electrical arc that damages the contact surfaces, degrades the insulating housing, and poses a serious risk of burns, electrical shock, or fire. At 400A, the energy in an arc event is substantial and can cause immediate injury. Always de-energize the circuit at the breaker or distribution panel, verify it is dead using a voltage tester, and only then disconnect. This applies to all K-LOK configurations: inline, panel mount, and threaded stud.
Will K-LOK 400A connectors mate with Cam-Lok, Marinco, or Leviton connectors already in my fleet?
Yes. K-LOK 400A connectors are intermateable with Series 16-style cam-type single-pole connectors from major manufacturers. This means you can introduce K-LOK into an existing power distribution system without replacing everything at once. If you are running a mixed fleet or specifying K-LOK alongside another brand for a new build, contact KUPO for the cross-compatibility statement document, which lists confirmed mating configurations and any connector pairings to avoid.
Which configuration do I need: Inline, Threaded Stud Panel Mount, or Double Set-Screw Panel Receptacle?
Inline Connectors (KL-400LM / KL-400LF) terminate directly onto cable. Use these for feeder runs, cable extensions, and any connection between two cable ends. Threaded Stud Panel Mount Receptacles (KL-400SM / KL-400SF) bolt permanently into a distribution box or equipment panel via a threaded M12 stud, with the conductor terminated to the rear. Choose these when you are building a fixed panel with a secure, threaded mounting point. Double Set-Screw Panel Receptacles (KL-400SSM / KL-400SSF) also mount permanently into a panel, but use double set-screw termination instead of a threaded stud. These are the right choice when your enclosure design does not accommodate a threaded stud, or when you need faster field re-termination on the panel side.
What safety certifications does K-LOK 400A carry, and can I reference them in a spec package?
K-LOK 400A connectors are UL Listed for the United States under File Number E332947, tested to UL 1691 (Standard for Single Pole Locking-Type Separable Connectors). They carry a UL Enclosure Type 3R (when mated) environment rating, meaning they are rated for outdoor use with protection against falling rain and external ice formation. They are also RoHS compliant. You can reference the UL file number directly in bid documents and spec packages. For a compliance pack with certificate copies, contact KUPO.
How do I pick the correct phase identification color for my region?
All 9 K-LOK 400A colors are available across every configuration, so you can match any regional phase convention precisely. In North America at 120/208V (NEMA/NEC): Black (L1), Red (L2), Blue (L3), White (Neutral), Green (Ground). At 277/480V: Brown (L1), Orange (L2), Yellow (L3), Gray (Neutral), Green (Ground). Under IEC 60445 (Europe, UK, Australia): Brown (L1), Black (L2), Gray (L3), Blue (Neutral), Green-Yellow (Ground). The full international color table is on this page. If you are specifying for a project that spans multiple regions or voltage systems, contact KUPO so we can help you build a single color-coded BOM (Bill of Materials) that covers all your circuits.
What conductor sizes will K-LOK 400A accept, and what if my cable is on the smaller end?
The standard cable access range is #6 AWG through 4/0 AWG (0.33" to 1.00" conductor diameter). For #6 AWG or #4 AWG conductors, a longer set screw is required to ensure a secure grip on the smaller diameter. Specify this when ordering. Additionally, the standard cable-access hole in the brass contact is 16.90 mm, but two smaller diameters are available on request: 14.60 mm (medium) and 10.40 mm (small). This is a meaningful advantage if you run mixed cable builds and want a tight, consistent contact without adapter workarounds.
Do I need special tools to assemble K-LOK connectors in the field?
No. K-LOK 400A connectors are designed for tool-simple assembly. Inline connectors require only a wire stripper, a hex wrench for the set screws, and the copper shim and strain-relief wire used in the termination process. Panel mount receptacles require the same plus a wrench for the M12 mounting nut. No hydraulic crimpers, proprietary dies, or brand-specific tooling are needed. This keeps your crews moving fast during load-in and makes field re-termination practical without specialized equipment. Step-by-step installation guidance with photographs is available in the Installation section above, and a downloadable PDF guide is available in the Downloads section.
What makes the K-LOK retaining screw design different from other cam-type connectors?
The KL-400-BS retaining screw is made from POM (polyoxymethylene), a non-conductive engineering polymer. It passes through the full brass contact and locks it firmly into the Santoprene body. Because it is non-conductive, it eliminates accidental current paths through the retaining hardware, a risk that exists with metallic retaining components. POM also resists moisture absorption and chemical degradation, which matters in outdoor and industrial environments. The retaining screw should be inspected at each re-termination and replaced if you see any sign of deformation, cracking, or thread wear. It is orderable as a standalone spare part (KL-400-BS).
Where can I use K-LOK 400A connectors? Are they rated for outdoor or wet environments?
K-LOK 400A connectors carry a UL Enclosure Type 3R (when mated) rating, which means they are suitable for outdoor use with protection against falling rain and external ice formation. The Santoprene body compound is rated to 105 degrees Celsius and resists UV degradation, oil, and common industrial chemicals. The ribbed grip geometry is specifically designed for secure handling in wet or gloved-hand conditions. These connectors are widely used in outdoor concert and festival power distribution, construction site temporary power, film and television location shoots, and industrial environments where equipment is exposed to weather.
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