Complete Lutron MS-OPS5M Wiring Diagram Schematic for Installation

For a five-wire occupancy sensor installation, connect the black (hot) wire to the incoming power line (120V). Link the red (load) wire to the fixture or controlled device. The white (neutral) wire joins the circuit’s neutral conductor, while the green (ground) attaches to the grounding terminal. Leave the orange (control) wire disconnected unless integrating with an external switch–then pair it to the switch’s output.

Power must first reach the device before engaging the controlled load: this prevents false triggers during initial setup. Verify wire gauge matches the circuit’s amperage–18 AWG suffices for standard 5A loads, but upsize to 16 AWG for 8A or extended cable runs. Keep lead lengths under 100 feet to maintain signal integrity.

In multi-way configurations, attach the sensor’s red lead to the first switch’s common terminal, then link subsequent switches in series using the traveler wires. Avoid mixing neutrals across multiple circuits to prevent ground loops. If dimming is required, substitute a compatible dimmer module between the red and load wires–ensure voltage compatibility (120V only).

Test connections with a non-contact voltage tester before energizing the circuit. Confirm the sensor’s field of view covers the intended area (360° detection up to 25 feet in diameter) and adjust sensitivity via the onboard dial–rotate clockwise for higher responsiveness, counterclockwise for longer delay-off periods (15 seconds to 30 minutes).

Installation Guide for the MS-OPS5M Occupancy Sensor

Connect the red load wire from the sensor to the switched hot terminal on your lighting fixture or relay. This ensures the device delivers power only when motion is detected, preventing unnecessary energy consumption during inactive periods.

Attach the black wire from the sensor to the permanent hot line, typically marked in electrical boxes. Verify the voltage matches the sensor’s specifications–120V to 277V AC–to avoid damaging internal components or causing malfunctions.

Ground the green or bare wire to the grounding screw or terminal in the junction box. Proper grounding is critical for safety, reducing risks of electrical shock or interference that could disrupt sensor functionality.

For multi-way control, link the blue wire to additional switches. This allows coordination between manual switches and the sensor, enabling seamless overrides or extended coverage across larger areas without conflicts.

Use a 16-gauge solid copper wire for all connections, ensuring secure splices with twist-on connectors or lever nuts. Loose connections generate heat, increasing resistance and potentially causing the sensor to trigger erratically or fail prematurely.

After wiring, test the sensor by moving within its detection zone–typically 180 degrees at up to 25 feet. Adjust sensitivity and timeout settings using the onboard dials if the device activates too frequently or not at all in high-traffic areas.

If integrating with a low-voltage system, pair the sensor with a compatible relay rated for the voltage and load type. Refer to the manufacturer’s load compatibility table to confirm the device supports your specific lighting or HVAC equipment without overloading circuits.

Understanding the Terminal Connections on the Occupancy Sensor Switch

Connect the load wire to the brass-colored terminal marked “LOAD” or “L.” This ensures the switch controls the intended fixture without interference. Verify the wire gauge matches the switch’s 14–12 AWG rating–thicker wires risk poor contact, while thinner ones may overheat. Use a torque screwdriver to tighten terminal screws to 12 in-lbs for secure, reliable connections.

• Ground terminal (green screw): Always attach the bare or green ground wire here first, even if the circuit lacks a ground. This prevents accidental shorts during installation.
• Neutral terminal (silver screw labeled “N”): Required for LED and fluorescent loads. Skip this only if the circuit is old and lacks a neutral wire–confirm with a voltmeter before proceeding.
• Line terminal (black screw labeled “LINE” or “HOT”): Connect the incoming power source here. Double-check polarity with a non-contact voltage tester before handling.

For multi-location setups, the “TRAVELER” terminals (if present) link to companion switches. Use only matched pairs–mixing brands risks erratic behavior. Strip wires to 5/8 inch; longer strands can touch adjacent terminals, causing shorts. Twist stranded wires clockwise before insertion to prevent fraying under the screw.

After securing connections, fold wires neatly into the electrical box, leaving the switch’s motion sensor lens unobstructed. Test by toggling the air-gap switch (small rectangular tab)–this cuts power instantly if adjustments are needed. If the fixture flickers, revisit the neutral connection: many issues trace back to improper neutral routing.

1. Power down the circuit at the breaker.
2. Remove the faceplate and existing switch, if replacing.
3. Label wires with masking tape if multiple cables are present.
4. Attach wires to corresponding terminals, following color codes: black (hot), white (neutral), green/bare (ground).
5. Fasten the switch to the box, ensuring no wires pinch behind it.
6. Restore power and test occupancy/vacancy modes with the switch’s onboard button.

For dimming functions, pair the switch with compatible LEDs only–check the bulb’s packaging for “dimmable” labeling. Non-dimmable bulbs will hum or fail prematurely. If the switch hums under load, replace it immediately: this signals a faulty internal relay, a fire hazard with prolonged use.

Step-by-Step Guide for Single-Pole Setup

Turn off power at the circuit breaker to prevent electric shock. Strip 1/2 inch of insulation from the ends of both the hot (black) and neutral (white) wires using wire strippers. Connect the black wire to the brass-colored terminal on the occupancy sensor and tighten the screw securely. Attach the white wire to the silver-colored terminal in the same manner. If grounding (green or bare copper wire) is present, fasten it to the green grounding screw.

Finalizing the Connection

Tuck the connected wires carefully into the electrical box, ensuring no exposed copper touches the metal enclosure. Align the sensor’s mounting bracket with the box’s screw holes and secure it firmly. Restore power at the breaker and test the installation by waving a hand in front of the device–the load should activate within 30 seconds. If the device fails to respond, recheck wire connections for loose screws or reversed polarity.

Connecting the MS-OPS5 Occupancy Sensor for Multi-Location Control

Identify the power source wire (typically black) from the circuit breaker and connect it to the common terminal on the primary sensor. Use a 14 AWG solid copper conductor if the existing wire gauge is smaller to ensure stable current delivery in 3-way setups. Label this wire “Line” before proceeding to avoid confusion during verification.

Attach the neutral wire (white) directly to the sensor’s neutral input–no branching required unless integrating multiple devices. If the circuit lacks a dedicated neutral at the switch box (common in older installations), run a new 12/2 NM cable from the panel to meet NEC 404.2(C) requirements. Verify continuity with a multimeter before securing connections.

Wire Color	Terminal Label	Action
Black	Common (primary)	Connect to power source
Red	Traveler (secondary)	Link to second switch
White	Neutral	Direct to sensor input

Route the red traveler wire from the primary sensor’s traveler terminal to the corresponding terminal on the secondary mechanical switch. Use wire nuts rated for 90°C insulation when joining wires, ensuring no exposed copper extends beyond 1/4 inch to prevent arcing. For loads exceeding 150W, downgrade to 12 AWG to prevent voltage drop.

Connect the load wire (black or red, depending on the fixture) to the sensor’s load terminal. Test the circuit with a non-contact voltage tester before restoring power–any residual voltage indicates a miswired traveler or neutral. If the fixture fails to respond, swap the traveler wires at one end; polarity errors are the most common failure point in multi-switch configurations.

Set the sensor’s time delay between 2 to 5 minutes using the onboard dial to balance energy savings with usability. For high-traffic areas, reduce sensitivity by covering 20-30% of the sensor’s lens with opaque tape to prevent false triggers. Position the sensor at a minimum height of 8 feet to detect motion across the full coverage area (26 ft radius in dual-switch mode).

Secure all connections with insulated wire nuts, wrapping clockwise with electrical tape for added strain relief. Enclose the sensor in a UL-listed switch box rated for damp locations if installing in bathrooms or outdoor-adjacent spaces. Avoid mounting the unit near HVAC vents or windows, as temperature fluctuations can impair PIR detection accuracy.

Finalize testing by toggling the secondary switch; both locations must independently control the load without flickering or delay. If the sensor fails to override the mechanical switch during occupancy, reverse the traveler wires or inspect the circuit for shared neutrals–a violation of NEC 300.3(B) that can cause erratic behavior.

Common Mistakes to Avoid When Installing the Occupancy Sensor

Connecting the sensor’s load terminal directly to a constant power source instead of through a compatible dimmer or switch will bypass its motion-based activation, rendering it useless. Verify the device’s documentation for terminal identification–confusing the neutral (white) and line (black) wires leads to immediate failure or damage. Always use a multimeter to confirm voltage absence before handling connections, as residual current persists even after circuit breakers trip.

Interference and Mounting Errors

• Obstruction placement: Installing the unit behind doors, furniture, or within 1.5 metres of HVAC vents reduces detection accuracy by 60%. Position it at 2.1–2.4 metres height, angled downward for optimal 360° coverage.
• Cross-talk: Placing multiple sensors closer than 6 metres apart causes signal overlap. Use different sensitivity settings or install a single unit with an occupancy range exceeding 185 square metres.
• Incorrect calibration: Skipping the 24-hour learning phase forces manual adjustment, which often misaligns with actual usage patterns. Follow the default setup sequence before overriding settings.

1. Inspect insulated wire ends for fraying–stripped lengths must match terminal depth (typically 10–12 mm).
2. Secure all connections with torque-rated screwdrivers (0.8–1.2 Nm) to prevent loosening from thermal expansion.
3. Avoid using stranded wire without ferrule crimps; solid core is required for reliability.