Name: PEPPERL+FUCHS 3RG4143-6AD00 Inductive Proximity Switch, M18 PNP NO, 4 mm Sn - MASSIVE
SKU: PEPPERL+FUCHS 3RG4143-6AD00

PEPPERL+FUCHS 3RG4143-6AD00 Inductive Proximity Switch, M18 PNP NO, 4 mm Sn

Brand ABB

Model PEPPERL+FUCHS 3RG4143-6AD00

The PEPPERL+FUCHS 3RG4143-6AD00 is a cylindrical M18 inductive proximity switch from the Pepperl+Fuchs 3RG4 Classic family, engineered for non-contact detection of metallic targets in continuous industrial operation. It belongs to the generation of “economy but not cheap” sensors that helped define the M18 form factor as the default choice for position and presence sensing on European-built machinery from the mid-2000s through the 2010s. The operating principle is the damped-oscillator method: an LC tank driven by an ASIC creates a high-frequency electromagnetic field at the sensing face; when a conductive target enters that field, eddy currents in the target consume energy, the oscillation collapses, and the output stage switches. Because there is no mechanical contact, the PEPPERL+FUCHS 3RG4143-6AD00 has no wear parts, no plunger to stick, and no micro-switch to bounce, which is why it is routinely specified as a direct replacement for limit switches in dirty, oily, or high-cycle applications.

Electrically, the PEPPERL+FUCHS 3RG4143-6AD00 runs on a 10–30 V DC supply and provides a PNP, normally open, three-wire output rated at up to 200 mA. That combination interfaces directly with the sinking inputs of Siemens SIMATIC (SM 321 / SM 1221), Rockwell ControlLogix and CompactLogix, Mitsubishi FX/Q, and Omron NJ/NX input modules without interposing relays. A switching frequency of at least 2000 Hz gives the sensor a response time well under 1 ms, so it can count bottle caps, gear teeth, or stamped parts on a conveyor moving at several meters per second without dropping edges. The rated switching distance is 4 mm against ST37 mild steel, and the repeat accuracy is better than ±0.5 % of Sn, which matters far more in practice than the nominal distance: a sensor that switches at the same point on the tenth of a millimeter, shift after shift, is what keeps a rejection gate from double-firing.

Physically, the PEPPERL+FUCHS 3RG4143-6AD00 is a nickel-plated brass cylinder on an M18 × 1 thread, with a 2 m PVC-jacketed three-core cable molded into the rear. The sensing face is epoxy-sealed and carries the switching-status LED, while the body tolerates vibration, coolant, oil mist, and the thermal shock of a nightly CIP washdown. The IP67 rating, CE / cULus / EAC approvals, and an operating range of –25 °C to +70 °C make it admissible in North American, European, and CIS plant environments without requalification. Although the model has been declared obsolete at the manufacturer level and superseded by IO-Link capable 3RG6 variants, it remains a high-demand legacy spare: for a plant running a bill-of-material frozen German OEM line, a like-for-like PEPPERL+FUCHS 3RG4143-6AD00 preserves the PLC tag, the bracket, the cable route, and the mechanic’s muscle memory.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	3RG4143-6AD00
Manufacturer	Pepperl+Fuchs GmbH (Mannheim, Germany)
Product Type	Inductive Proximity Switch, cylindrical
Product Series	3RG4 Classic series (legacy, no longer for sale new from manufacturer)
Housing Thread	M18 × 1
Rated Switching Distance (Sn)	4 mm (versus ST37 / Fe37 mild steel, non-flush)
Assured Switching Distance (Sa)	0 … 3.2 mm
Reduction Factor (non-ferrous)	Approx. 0.4 × Sn for brass, 0.3 × Sn for aluminum
Supply Voltage (UB)	10 … 30 V DC, ripple ≤ 10 %
Output Type	PNP, Normally Open (NO), 3-wire DC
Rated Operational Current (Ie)	≤ 200 mA (at ≤ +50 °C), with derating above 50 °C
No-load Supply Current	≤ 15 mA
Switching Frequency	≥ 2000 Hz
Response / Reset Time	≤ 0.25 ms / ≤ 0.3 ms
Repeat Accuracy	< ±0.5 % of Sn
Hysteresis	1 … 10 % of Sn (typical ≈ 5 %)
Protection Rating	IP67 (dust-tight; protection against temporary immersion)
Housing Material	Brass, nickel-plated
Sensing Face	PBT / epoxy-sealed, with LED switching indicator
Connection	2 m PVC cable, 3 × 0.25 mm², molded strain relief (brown = +UB, blue = 0 V, black = output)
Ambient Temperature	–25 °C … +70 °C (–13 °F … +158 °F)
Storage Temperature	–40 °C … +85 °C
Short-circuit Protection	Yes, auto-resetting
Reverse Polarity / Overload Protection	Yes / Yes
Mounting	Flush or non-flush (full 4 mm Sn in non-flush; side-clearance ≥ 4 × sensor diameter from adjacent steel)
Tightening Torque	≤ 5 N·m
Certifications / Directives	CE, cULus, EAC; EMC EN 60947-5-2 / EN 55011 class B

Main Features and Advantages

Rugged nickel-plated brass body: The PEPPERL+FUCHS 3RG4143-6AD00 uses a machined brass housing with a nickel plate rather than the zinc die-cast or glass-filled nylon bodies common among entry-level M18 sensors. That choice pays for itself in weld-spatter cells, near salt spray, and in outdoor material-handling skids, where plain steel threads pit within a season and plastic threads lose dimensional stability after a few thermal cycles. The nickel layer is a sacrificial corrosion barrier, while the M18 × 1 thread retains its pitch so the sensor can be torqued to 5 N·m repeatedly without galling. The molded PVC cable entry avoids the failure point that plagues sensors with a separate gland: there is no path for coolant to wick along the conductor bundle.

High-speed switching envelope: A 2000 Hz switching frequency is not a marketing number pulled from a bench test; it is the reason the PEPPERL+FUCHS 3RG4143-6AD00 is still specified on high-throughput lines. At 2000 Hz the sensor can resolve targets separated by roughly 0.5 ms, which at a belt speed of 1 m/s corresponds to about 0.5 mm of travel. In practice this means reliable gear-tooth counting, cam indexing, and small-part detection where a general-purpose 500 Hz sensor would alias and miss. Combined with a repeat accuracy under ±0.5 % of Sn, the output edge arrives at the same mechanical position every cycle, keeping a rejection solenoid from acting early and scattering product.

Built-in fault tolerance: The PEPPERL+FUCHS 3RG4143-6AD00 contains three protections that save commissioning time: reverse-polarity protection, short-circuit protection with auto-recovery, and overload limitation. A wiring mistake that would destroy a bare transistor output merely lights the LED differently and waits for correction. For maintenance crews working inside a running panel, that forgiveness is worth more than a marginally lower price. The wide 10–30 V DC supply window also means the sensor tolerates the 24 V DC bus droop that occurs when a contactor bank picks up, without retriggering or dropping out.

Drop-in mechanical compatibility: Because the M18 × 1 form factor and the 4 mm Sn are de facto industry standards, the PEPPERL+FUCHS 3RG4143-6AD00 drops into the brackets, standoff tubes, and swivel mounts already on the machine. No re-machining, no new drill jig, no change to the PLC tag table. For a five-year preventive-maintenance cycle on a 2005–2015 vintage line, that is the difference between a thirty-minute pit stop and a weekend retrofit. The 2 m fixed cable is the right call when the junction box is nearby; where quick changeover matters, the connectorized variant is the sensible sibling.

Legacy availability and lifecycle value: The PEPPERL+FUCHS 3RG4143-6AD00 is no longer manufactured, yet global installed base demand keeps tested new-surplus and new-old-stock units in circulation. Sourcing a genuine legacy part extends the life of a certified machine rather than forcing an IO-Link migration that changes the control narrative, the spare-parts list, and the operator interface all at once.