DKLD LDZ-6-4-18A-127V 5E4 IP55 T85 Push Button Switch 6-pin

DKLD · 18mm Threaded Bushing · 6A 127VAC · IP55 · T85 · 6-Pin · Panel-Mount Operator

The DKLD LDZ-6-4-18A-127V 5E4 IP55 T85 is a 22mm panel-mount operator from the LDZ-6 family: an 18mm threaded bushing, a 4-contact (commonly 2 NO + 2 NC) contact block rated 6A at 127VAC, IP55 dust and water-jet protection, and a T85 (85°C maximum surface temperature) thermal class. The 6-pin termination is the typical fitment for emergency-stop, push-button, and selector-switch bodies used in motor-start stations, hoist pendants, and machine-tool control panels.

KOEED stocks DKLD operators for OEMs, panel builders, and maintenance engineers who need an industrial-rated 22mm push button at a multi-brand BOM price. The LDZ-6-4-18A sits comfortably next to Allen-Bradley 800F, Siemens SIRIUS 3SB3, Schneider Harmony XB4 / XB5, and Omron A22 operators, while the form factor also drops into retrofit kits on Mitsubishi MELSEC, Yaskawa MP-controlled cabinets, and Fanuc CNC operator desks. Panasonic FP-series PLCs and KEYENCE vision-cell panels can also be paired through standard contact-block logic.

Key Technical Specifications

The LDZ-6-4-18A-127V is built for hard-industrial panels. The 5E4 marking is read here as an IEC 60947-5-1 utilisation category reference for low-voltage switchgear, consistent with the contact rating printed on the body. All parameters below are read directly from the part-number code; if you need a vendor datasheet for QA release, send a request to Moritta@KOEED.COM.

Application Scenarios — Where It Fits

• Motor start / stop stations. Used as a flush momentary "Start" + mushroom "Stop" pair on the door of a motor control centre (MCC). The 4-contact block gives you enough poles for seal-in + indicator lamp logic without adding a second block.
• Emergency-stop (E-stop) circuits. Twisted-locking mushroom bodies in red / yellow are the most common fitment for the LDZ-6-4-18A chassis. Two NC poles give you redundant safety paths into a safety relay or contactor.
• Hoist, crane and pendant control. The 22mm form factor and IP55 front face make it a drop-in for indoor hoist pendants, especially where the original Schneider XB4 or Omron A22 is no longer stocked locally.
• Machine-tool control panels. Lathes, mills, drill presses and grinders often use a 22mm selector for Run / Jog / Off, with separate push buttons for cycle start and feed-hold. KOEED sees steady DKLD demand from panel builders integrating to Fanuc 0i-MD or Mitsubishi M80 controllers.
• Conveyor and material-handling lines. Pull-cord and belt-alignment reset stations typically use a 6-pin, 4-contact reset button. The IP55 rating tolerates wash-down in food, beverage, and packaging cells that pair with KEYENCE vision inspection.
• OEM equipment builds and skid packages. Compressor skids, pump skids, and small HVAC panels use 22mm operators as a cost-effective way to keep the BOM at one footprint. Yaskawa MP-controlled inverters and Panasonic FP-series PLCs are common companions.
• Retrofit and obsolete replacement. Plant engineers replacing 1990s-era 22mm operators (often Japanese origin) find the LDZ-6-4-18A pin-compatible in depth and bushing size, with a more accessible China-sourcing lead time than the original brand.

Browse the full All collection index or jump straight to a brand family — Allen-Bradley ControlLogix and Siemens SIMATIC pages list the typical PLC pairings for a station built around this operator.

Integration & Wiring Notes

The 6-pin contact block is wired as two independent poles plus a common per pole (or, on the 4-pole variant, four independent commons). Mark the common terminals at the panel-build stage — a miswired common on a 4-pole E-stop is the most common cause of an intermittent fault at commissioning. Polarity is not polarity-sensitive on AC, but on a 24VDC indicator version, respect the LED polarity stamped next to the contact block.

Torque the rear locking nut to 1.2–1.5 N·m so the bushing seats against the panel gasket without cracking it. For a 4-contact block at 6A / 127VAC, plan a derating of about 25% when bundling more than four operators in a single vertical column, or when the panel is mounted in an enclosure that runs above 50°C ambient. The T85 marking refers to the maximum accessible surface temperature under normal operation, not an ambient ceiling.

For E-stop circuits that interface to a safety relay, the two NC poles of the LDZ-6-4-18A can be wired as dual-channel inputs. KOEED typically sources Pilz, Sick, or Banner safety relays alongside the operator — send the safety-relay model number along with the LDZ-6-4-18A line item so the BOM is checked in one pass. If you need to look up an error code or validate a 24VDC coil against a 6A contact block, the PLC Error Code Database and the PLC Hex to Float Converter are quick references during commissioning.

If the station will run a 0–10V or 4–20mA speed reference alongside the operator, use the PLC Analog Calculator to scale the analog channel to the engineering units on the HMI; mismatched scaling is the second most common reason a retrofitted station reads "wrong" RPM.

Installation & Commissioning Tips

• Panel cutout tolerance. 22.0 + 0.3 / − 0.0 mm. Anything looser and the IP55 seal loses compression; anything tighter and the bushing cracks on insertion. Use a Greenlee-type step punch, not a hand nibbler.
• Front-face orientation. The 18mm threaded bushing is keyed for anti-rotation. If the actuator rotates in the cutout, the locking nut is under-torqued or the anti-rotation tab is missing — do not continue commissioning until corrected, the IP55 seal depends on the bushing not spinning.
• Wire gauge and ferrule. The 6-pin block accepts 0.5–1.5 mm² (20–16 AWG) stranded. Use ferrules on stranded wire, or the screw clamp will pinch only a few strands and the contact will run hot at 6A.
• Continuity test before energising. With the contact block removed from the bushing, ring out each pole with a buzzer. A 4-contact block should show four independent commons, with NO closed only when the actuator is pressed and NC closed only when released (or vice versa for a maintained selector).
• Thermal check at first load. After 30 minutes at full load, scan the front face with a thermal camera. Anything above 60°C surface temperature on a T85-rated part indicates under-rated current, poor contact pressure, or both.
• Spare block policy. KOEED typically quotes 10% spare contact blocks with an LDZ-6 station build. Spare blocks wear out faster than the operator body, and a 30-second swap in the field is cheaper than an unscheduled line stop.

For photos of a finished LDZ-6 station build (front face, rear wiring, gasket detail), see the Our Gallery page; for live BOM and ship-out examples, the Real-Time Records page shows recent KOEED shipments of similar operator kits.

Procurement, Warranty & Lead Time

KOEED is a multi-brand industrial automation distributor, not an OEM subsidiary. We source the DKLD LDZ-6-4-18A-127V 5E4 IP55 T85 as part of our China sourcing supply line and keep stock for spot purchases and panel-build contracts. The part is shipped with a 12-month warranty against manufacturing defect, and every shipment includes a basic visual QC report; for QA-release paperwork, request a full inspection report at RFQ time and we will add it to the quote.

Lead time is typically 3–7 business days for in-stock single-piece and small-quantity orders, and 2–4 weeks for full panel-build BOMs that include Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, or KEYENCE parts in the same shipment. Worldwide shipping is via DHL, FedEx, UPS, or nominated freight forwarder; see the Shipping Policy page for cut-off times and export docs.

Pricing is RFQ-only on this part number. Send your full BOM — LDZ-6 bodies, contact blocks, legend plates, and any paired PLC or HMI line items — to Moritta@KOEED.COM and KOEED will return availability, lead time, and a single line-item quote within 24 business hours. For new customers, opening an account is a one-email step: company name, end-user country, and a brief note on the application is enough. If you are unsure whether the LDZ-6-4-18A is the right body for your application, the KOEED AI Diagnostic Tool can take a nameplate photo and suggest pin-compatible alternatives.