MA-T51MNB Maestro Countdown Timer
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Specifications:
- Model: MA-T51MNB
- Product: Maestro Timer Switch
- Voltage: 120 V~
- Frequency: 50 / 60 Hz
Product Usage Instructions:
1. Determine Wiring Type:
Identify if your setup is for lights and/or a fan switched from
one location.
2. Turn Power OFF:
Before installing, switch off the power at the circuit breaker
to prevent any electrical hazards.
3. Remove Existing Device:
Disconnect the black wire, white wire, black wire, and ground
wire from the existing device.
4. Remove Middle Sections (if ganging devices):
If mounting multiple devices side by side, remove middle
sections as necessary. Refer to the Maximum Ratings chart for
wattage limits.
5. Connect the New Timer Switch:
This product requires a neutral wire. Connect the wires properly
by wrapping around screws or inserting into push-in terminals.
6. Mount the Timer Switch:
Secure the timer switch in place using the provided screws.
7. Turn Power ON:
Restore power at the circuit breaker to activate the timer
switch.
FAQ:
- Q: Can this timer switch be used to control
receptacles? - A: No, to avoid overheating and potential
damage, do not use this switch to control receptacles. - Q: What are some important installation
considerations? - A: Install in compliance with national and
local electrical codes, and ensure proper grounding. - Q: Are Timer Indicator Lights available on the
accessory switch? - A: The Timer Indicator Lights are not
available on the accessory switch (TILs).
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MA-T51MNB
Maximum load ratings: · 150 W LED / CFL · 450 W MLV · 600 W ELV · 600 W Incandescent / Halogen · 3 A Fan · 5 A Fluorescent
Maestro Timer Switch
English 120 V~ 50 / 60 Hz
Please visit www.lutron.com/ma-t51mnb for: · Helpful videos · Advanced programming and operation · Additional wiring scenarios · If you have three or more switches controlling a light
Please read before installing
For lights and / or a fan switched from one location
(For lights and / or a fan switched from two locations, see instructions starting on page 4)
1 Determine wiring type
For lights and / or a fan switched from two locations, see instructions starting on page 4. For lights and / or a fan switched from one location, proceed to Step 2 below.
2 Turn power OFF at circuit breaker
WARNING: SHOCK HAZARD. May result in serious injury or death. Turn off power at circuit breaker or fuse before installing.
ON OFF
3 Remove existing device
Disconnect wires.
Black wire
White wire
Black wire
Ground wire (bare or green)
01/2025
1
P/N 0302206 Rev A
MA-T51MNB
For lights and / or a fan switched from one location (continued)
(For lights and / or a fan switched from two locations, see instructions starting on page 4)
4 Remove middle sections (if ganging devices)
Remove middle sections if mounting two or more devices side by side. See Maximum Ratings chart below for the new wattage limits. NOTE: No derating is required when using only CFLs or LEDs.
Keep
MAXIMUM RATINGS FOR MIXED LOAD TYPES
Remove
Load Type
LED/CFL Halogen/ Incandescent Magnetic Low-Voltage* Electronic Low-Voltage Fluorescent General Purpose Fan
No Sides Removed
1.25 A / 150 W
Maximum Load
1 Side Removed
2 Sides Removed
1.25 A / 150 W 1.25 A / 150 W
600 W
500 W
400 W
600 VA / 450 W 500 VA / 400 W 400 VA / 300 W
600 W 5 A 3 A
500 W 4 A 3 A
400 W 3 A 3 A
*Note: The maximum lamp wattage is determined by the efficiency of the transformer, with 7085% as typical. For actual transformer efficiency, contact either the fixture or transformer manufacturer. The total VA rating of the transformer(s) shall not exceed the VA rating of the timer switch.
5 Connect the new timer switch (this product requires a neutral wire!)
Fully wrap the wires around the screw and tighten (A), or strip insulated wires to 1/2 in (13 mm) and insert into the push-in terminals (B).
A OR
Use 12 AWG / 14 AWG (4 mm2 / 2.5 mm2)
B
Use 14 AWG (2.5 mm2)
1/2 in (13 mm)
Brass screw
Black – Timer Circuit
Silver screw
White
On
45
30
15
Black –
5
Black screw
Line / Hot
Green
2
Ground (bare or green)
01/2025 P/N 0302206 Rev A
MA-T51MNB For lights and / or a fan switched from one location (continued) (For lights and / or a fan switched from two locations, see instructions starting on page 4)
6 Mount the timer switch using the provided screws
+
7 Turn power ON at circuit breaker
ON OFF
FASS · FASS
SS · FASS · F
OPERATION
Tap Button Options
· Tap once when unit is off:
Controlled load turns ON
and the timer switch begins.
T
When time expires, load turns OFF.
R
· Tap once when unit is on: Controlled load turns OFF
and the timer switch resets.
L
· FASS · FA
Press to increase time Press to reduce time
FASS Pull tab out for bulb replacement.
IMPORTANT
1. CAUTION: To avoid overheating and possible damage to other equipment, do not use to control receptacles.
2. Install in accordance with all national and local electrical codes. 3. Grounding: When no “grounding means” exists in wallbox, the 2011
National Electrical Code® (NEC®) allows a control to be installed as a replacement if 1) a non-metallic, noncombustible faceplate is used with non-metallic attachment screws or 2) the circuit is protected by a ground fault circuit interrupter (GFCI). When installing a control according to these methods, cap or remove green wire before screwing control into wallbox. 4. Maestro timer switches are not compatible with standard 3-way / 4-way switches. For use only with Maestro accessory switches (MA-AS, MSC-AS). 5. Maestro accessory switches (MA-AS, MSC-AS) cannot be used individually and must be used in conjunction with a Maestro timer switch in a 3-way / 4-way application. 6. In any 3-way / 4-way circuit use only one timer switch (must be on the load side) with up to 9 accessory switches (MA-AS, MSC-AS). 7. Operate between 32 °F and 104 °F (0 °C and 40 °C), 0-90% relative humidity non-condensing. 8. Protect control from dust and dirt when painting or spackling. 9. Timer switch may feel warm to the touch during normal operation. 10.Recommended wallbox depth is 2.25 in (57 mm) minimum. 11.Maximum wire length between the timer switch and the farthest accessory switch (MA-AS, MSC-AS) is 250 ft (76 m). 12.For safety reasons, do not use the timer switch to control fixtures that are the only source of illumination for an area. 13.For cleaning recommendations, see www.lutron.com/cleaning
ASS · FASS ·
Timer Indicator Lights (TILs)
· White TILs indicate the timer switch duration or the remaining time in minutes. · The top TIL labeled ON has no time limit. · The bottom TIL blinks rapidly to indicate 1 minute of time remaining (TILs
are not available on the accessory switch).
01/2025
3
P/N 0302206 Rev A
MA-T51MNB
For lights and / or a fan switched from two locations
(For lights and / or a fan switched from three or more locations, please visit www.lutron.com/ma-t51mnb)
1 Turn power OFF at circuit breaker
WARNING: SHOCK HAZARD. May result in serious injury or death. Turn off power at circuit breaker or fuse before installing.
2 Remove (but do not disconnect) existing devices
COM ON OFF
3 Mark wire on the COMMON terminal
On both existing devices, mark the wire (for example, using electrical tape) that is connected to the screw that is a different color (typically black) than all the others. This screw terminal may also be labeled “COMMON” or “COM”. Does not include the ground screw.
Rear / side view of existing device
4 Disconnect wires 5 Remove middle sections (if ganging devices)
See Step 4 on page 2 for details.
4
01/2025 P/N 0302206 Rev A
MA-T51MNB
For lights and / or a fan switched from two locations (continued)
(For lights and / or a fan switched from three or more locations, please visit www.lutron.com/ma-t51mnb)
6 Connect the new timer switch and a Maestro accessory switch (MA-AS or MSC-AS)
Note: The timer switch must be installed on the load side of multi-location wiring.
Timer Switch
Accessory Switch
MA-AS or MSC-AS
Blue screw
Brass screw
On
Blue screw
45
30
15
5
Brass screw Silver screw Black screw
Black screw
Green wire
Marked wire
To fan / light(s)
FOR Ground wire ILLUSTRATION (bare or green) PURPOSES ONLY
(DO NOT DISCONNECT)
To breaker
FOR ILLUSTRATION PURPOSES ONLY
(DO NOT DISCONNECT)
Marked wire
Ground wire (bare or green)
Green wire
Fully wrap the wires around the screw and tighten (A), or strip insulated wires to 1/2 in (13 mm) and insert into the push-in terminals (B).
A
B
OR
Use 12 AWG / 14 AWG (4 mm2 / 2.5 mm2)
1/2 in (13 mm)
Use 14 AWG (2.5 mm2)
01/2025
5
P/N 0302206 Rev A
MA-T51MNB
For lights and / or a fan switched from two locations (continued)
(For lights and / or a fan switched from three or more locations, please visit www.lutron.com/ma-t51mnb)
7 Mount all devices using the provided screws
+
8 Turn power ON at circuit breaker
ON OFF
Troubleshooting
Symptom Load does not turn ON, but LED on timer switch is ON.
Load does not turn ON and LED on timer switch is OFF.
Load turns ON and timer switch works, but accessory switch does not work. Load does not remain ON, LED glows dimly or blinks.
Possible Cause
· Light bulbs are burned out. · Timer switch is not properly wired. · Neutral wire is not connected. · Load not properly installed. · Fan not turned on at fixture.
· Timer switch is not properly wired, wires connected to brass and black screw terminals may be reversed. · Neutral wire is not connected. · Front Accessible Service Switch (FASS) on timer switch or any accessory awitch is pulled out to the OFF position. · Breaker is OFF or tripped.
· Wire connected to the blue screw terminal on timer switch is not the same wire connected to the blue screw terminal on accessory switch.
· Timer switch is not installed on the load side of the circuit.
· Blue screw terminal miswired to neutral wire or touching ground.
Help
U.S.A. | Canada | Caribbean 1.844.LUTRON1 (588.7661)
Mexico
+1.888.235.2910
Others
+1.610.282.3800
Limited Warranty: www.lutron.com/TechnicalDocumentLibrary/369-119_Wallbox_Warranty.pdf Lutron, the Lutron logo, and Maestro are trademarks or registered trademarks of Lutron Electronics Co. Inc., in the U.S. and/or other countries. All other product names, logos, and brands are property of their respective owners.
01/2025
6
P/N 0302206 Rev A
Documents / Resources
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LUTRON MA-T51MNB Maestro Countdown Timer [pdf] Installation Guide MA-T51MNB, MA-T51MNB Maestro Countdown Timer, Maestro Countdown Timer, Countdown Timer |