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Assembly settings
Front
Front form
Round

Round

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  • Rectangular
  • Round
  • Square
Front bezel colour
Black

Black

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  • Black
  • Blue
  • Chrome coloured
  • Colourless
  • Gold
  • Grey
  • Matt grey
  • Nature
  • Olive
  • Red
  • Sand grey
  • Silver
  • White
  • Yellow
Front bezel material
Plastic

Plastic

choose ...
  • Aluminium
  • Metal
  • Plastic
  • Plastic, according to UL 94 V0
  • Stainless steel
  • Stainless steel 304
  • Stainless steel 316
  • Stainless steel 316L
Front dimension
Ø 24,5 mm

Ø 24,5 mm

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  • 14 mm x 9 mm
  • 18 mm
  • 18 mm x 18 mm
  • 18,4 mm x 18,4 mm
  • 18,8 mm x 18,8 mm
  • 19 mm x 19 mm
  • 20 mm x 23,5 mm
  • 24 mm x 18 mm
  • 24 mm x 23,5 mm
  • 24 mm x 24 mm
  • 26 mm x 26 mm
  • 26,4 mm x 29 mm
  • 29,8 mm x 29,8 mm
  • 30 mm x 24 mm
  • 30 mm x 30 mm
  • 35 mm x 35 mm
  • 36 mm x 24 mm
  • 48 mm x 24 mm
  • 58 mm x 29 mm
  • 58 mm x 30 mm
  • 58 mm x 35 mm
  • 85 mm x 85 mm
  • 9 mm x 9 mm
  • Ø 16 mm
  • Ø 18 mm
  • Ø 18,3 mm
  • Ø 19 mm
  • Ø 22 mm
  • Ø 24 mm
  • Ø 24,5 mm
  • Ø 25 mm
  • Ø 27 mm
  • Ø 29 mm
  • Ø 29,5 mm
  • Ø 30 mm
  • Ø 32 mm
  • Ø 34 mm
  • Ø 34,75 mm
  • Ø 35 mm
  • Ø 37 mm
  • Ø 38 mm
  • Ø 39 mm
  • Ø 40 mm
  • Ø 42 mm
  • Ø 50 mm
  • Ø 60 mm
  • Ø 7 mm
  • Ø 9 mm
  • Ø 9,5 mm
  • Ø 90 mm
Mounting
Design
Raised

Raised

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  • Flush
  • PCB
  • Raised
Mounting type
Panel mounting

Panel mounting

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  • For sticking or snapping in place
  • Panel mounting
  • adhesive
  • for snapping in place
  • pole mounting Ø35mm
  • pole mounting Ø38mm
  • wall mounting
Operating-/Indication part
Lens shape
Mushroom-head

Mushroom-head

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  • Concave
  • Convex
  • Flush
  • Mushroom-head
  • Raised
Lens colour
Yellow

Yellow

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  • Amber
  • Black
  • Black-black
  • Black-red
  • Blue
  • Blue-blue
  • Blue-white
  • Colourless
  • Colourless-colourless
  • Gold
  • Green
  • Green-blue
  • Green-green
  • Green-red
  • Green-white
  • Grey
  • Light green
  • Nature
  • Olive green
  • Orange
  • Red
  • Red-blue
  • Red-green
  • Red-red
  • Red-white
  • Red-yellow
  • Silver
  • Smokey black
  • White
  • White-Black
  • White-white
  • Yellow
  • Yellow-green
  • Yellow-yellow
  • Zinc yellow
Lens material
Plastic

Plastic

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  • Aluminium
  • Plastic
  • Plastic metalised
  • Plastic, according to UL 94 HB
  • Plastic, according to UL 94 V0
  • Stainless steel
  • Stainless steel 316L
Lens illumination
Non illuminated

Non illuminated

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  • Illuminated
  • Non illuminated
  • Optional illuminated
Electrical characteristics
Contacts
1 NC / 1 NO

1 NC / 1 NO

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  • 1 C
  • 1 NC
  • 1 NC / 1 FS
  • 1 NC / 1 MC
  • 1 NC / 1 NO
  • 1 NC / 2 NO
  • 1 NO
  • 2 C
  • 2 NC
  • 2 NC / 1 NO
  • 2 NC / 2 NO
  • 2 NO
  • 3 NC
  • 3 NC / 3 NO
  • 3 NO
  • 4 NC / 4 NO
Switching rating
250 V @ 5 A

250 V @ 5 A

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  • 150 V AC/DC @ 3 A
  • 150 V AC/DC @ 5 A
  • 24 V DC @ 0,2 A
  • 240 V
  • 240 V @ 3 A
  • 240 V AC @ 3 A
  • 250 V
  • 250 V @ 10 A
  • 250 V @ 3 A
  • 250 V @ 5 A
  • 250 V AC @ 1,5 A
  • 250 V AC @ 3 A
  • 250 V AC @ 6 A
  • 250 V AC/DC
  • 250 V AC/DC @ 5 A
  • 30 V DC @ 0,1 A
  • 35 V @ 3 A
  • 35 V AC/DC @ 0,5 A
  • 35 V AC/DC @ 0,6 A
  • 36 V AC/DC @ 0,6 A
  • 400 V @ 10 A
  • 42 V
  • 42 V @ 0,1 A
  • 42 V AC @ 0,1 A
  • 42 V AC/DC @ 0,1 A
  • 42 V DC @ 0,1 A
  • 440 V AC @ 10 A
  • 48 V DC @ 0,5 A
  • 5 A
  • 50 V @ 0,1 A
  • 50 V @ 0,8 A
  • 50 V AC/DC @ 0,2 A
  • 50 V AC/DC @ 0,3 A
  • 500 V @ 10 A
  • 500 V AC @ 10 A
  • 500 V AC @ 6 A
  • 600 V AC @ 1,2 A
Mechanical Characteristics
Terminal
Soldering terminal

Soldering terminal

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  • 1.5 Series AMP Superseal 3 Pin Connector
  • Cable 200 mm
  • Cable 200 mm, 180°
  • Cable 200 mm, 180°, Conntector M12
  • Cable 200 mm, 90°
  • Cable 200 mm, 90°, Connector M12
  • Connector M12
  • Connector M12 (5 pins)
  • Double plug-in terminal, 6.3 x 0.8 mm
  • Flat ribbon cable
  • Flat ribbon cable 300 mm
  • PCB terminal
  • Plug-in terminal
  • Plug-in terminal, 2 x 0.5 mm
  • Plug-in terminal, 2.8 x 0.5 mm
  • Plug-in terminal, 2.8 x 0.8 mm
  • Plug-in terminal, 6.3 x 0.8 mm
  • Push-in terminal
  • Ring cable lug screw terminal
  • Screw terminal
  • Soldering terminal
  • Soldering terminal, 2.8 x 0.5 mm
  • Spring-type terminal
  • USB 3.0 socket type A-A
  • USB 3.0 socket type C-A
  • Universal soldering terminal
  • Universal terminal, 2 x 0.5 mm
Switching system
Snap-action switching element

Snap-action switching element

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  • Capacitive
  • Low-level element
  • Short-travel element
  • Slow-make switching element
  • Snap-action switching element
Contact material
Gold

Gold

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  • Gold
  • Gold-plated silver
  • Palladium
  • Rhodium/Silver
  • Silver
Switching action
Momentary

Momentary

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  • Maintained
  • Maintained (a) - Maintained
  • Maintained (a) - Rest (a) - Maintained
  • Maintained (a) - Rest (a) - Maintained (a)
  • Maintained (a) - Rest (a) - Momentary
  • Maintained (a) - Rest - Maintained
  • Maintained (a) - Rest - Maintained (a)
  • Maintained (a) - Rest - Momentary
  • Maintained - Maintained
  • Maintained - Maintained - Maintained - Maintained
  • Maintained - Maintained - Maintained - Momentary
  • Maintained - Maintained - Momentary - Momentary
  • Maintained - Momentary
  • Maintained - Momentary - Momentary - Momentary
  • Maintained - Rest
  • Maintained - Rest (a)
  • Maintained - Rest (a) - Maintained
  • Maintained - Rest (a) - Maintained (a)
  • Maintained - Rest (a) - Momentary
  • Maintained - Rest - Maintained
  • Maintained - Rest - Maintained (a)
  • Maintained - Rest - Momentary
  • Maintained or momentary
  • Momentary
  • Momentary - Rest
  • Momentary - Rest (a) - Maintained
  • Momentary - Rest (a) - Maintained (a)
  • Momentary - Rest (a) - Momentary
  • Momentary - Rest - Maintained
  • Momentary - Rest - Momentary
  • Momentary / maintained
  • Rest (a) - Maintained
  • Rest (a) - Maintained (a)
  • Rest (a) - Momentary
  • Rest - Maintained
  • Rest - Maintained (a)
  • Rest - Maintained - Maintained - Maintained - Maintained
  • Rest - Momentary
Ambient Condition
IP front protection
IP65, according to DIN EN 60529

IP65, according to DIN EN 60529

choose ...
  • IP20
  • IP20 / IP66 with cap closed (IEC-EN60529)
  • IP40
  • IP40, according to IEC 60529
  • IP44
  • IP65
  • IP65, IP66
  • IP65, IP66, IP67, according to DIN EN 60529
  • IP65, IP67
  • IP65, according to DIN EN 60529
  • IP66
  • IP66, IP67, IP69K
  • IP67
  • IP67 (ISO 20653)
  • IP67, according to DIN EN 60529
  • IP67, according to IEC 60529
  • IP69K
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Actuator

  • 51-156.0254

51-156.0254 Actuator, Ø 24,5 mm, Mushroom-head, Non illuminated, Yellow, Plastic, opaque, Round, Black, Plastic, 1 NC / 1 NO, Momentary, Soldering terminal, IP65, according to DIN EN 60529
51-156.0254
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Your product:
51-156.0254

51-156.0254

Actuator

Front
Front dimension:
Ø 24,5 mm
Front form:
Round
Front bezel colour:
Black
Front bezel material:
Plastic
Mounting
Design:
Raised
Mounting type:
Panel mounting
Operating-/Indication part
Lens colour:
Yellow
Lens material:
Plastic
Lens illumination:
Non illuminated
Lens shape:
Mushroom-head
Lens optics:
opaque
Electrical characteristics
Switching voltage and switching current:

250 VAC, 5 A (ohmic)

250 VAC, 3 A (Soldering terminal)

250 VAC, 2 A (inductive, cos(phi) = 0.7)

125 VAC, 3 A (inductive, cos(phi) = 0.7)

220 VDC, 0.1 A (inductive, L:R = 30 ms)

110 VDC, 0.2 A (inductive, L:R = 30 ms)

60 VDC, 0.7 A (inductive, L:R = 30 ms)

24 VDC, 2 A (inductive, L:R = 30 ms)
Contacts:
1 NC / 1 NO
Rated Operational Voltage Ue:
250 VAC/DC according to EN IEC 60947-1
Switching rating:
250 V @ 5 A
Electrical lifetime:
50 000 cycles of operation
Electric strength:
2500 VAC, 50 Hz, 1 min. between all terminals and earth, according to IEC 61058-1, part 15
Protection class:
ll
Standards:
According to EN/IEC 61058-1
Thermal current Ith:
5 A, according to EN / IEC 60947-5-1
The maximum current in continuous operation and at ambient temperature not exceeding the quoted maximum values.
Mechanical Characteristics
Terminal:
Soldering terminal
Contact material:
Gold
Switching action:
Momentary
Switching system:
Snap-action switching element
Switching system:
Self-cleaning, double-break snap action switching system, 1 normally closed and 1 normally open contact per element.
Mechanical lifetime:
2 Mil. cycles of operation
Operating force:
1,8 … 6 N, depending on the number of switching elements
Operating Travel:
3 mm
Tightening torque:
Fixing nut max. 0.5 Nm
Wire cross section:
Snap-action switching element with tinned soldering terminals at the sides
Max. wire diameter 2 wires à 1.2 mm
Max. wire cross-section of stranded cable 1 x 1 mm²
Weight:
0.014 kg
Ambient Condition
IP front protection:
IP65, according to DIN EN 60529
Operating temperature:
– 25 °C … + 55 °C
Storage temperature:
– 40 °C … + 85 °C
Shock resistance:
15 g for 11 ms, as per DIN / EN 60512-4-3, DIN / EN 60068-2-27 (Single impacts, semi-sinusoidal)
Vibration resistance:
10 g at 10 Hz…1500 Hz, amplitude 0.75 mm (Sinusoidal), according to DIN EN 60512-4-4, DIN EN 60068-2-6
Climate resistance:
Standard condition, as per DIN EN 60068-2-30
Changing condition, as per DIN EN 60068-2-14
Certificate
Approbations:
CB (IEC 61058-1), CQC, CSA, DNV, ENEC (EN 61058-1), UL
Conformities:
CE, UKCA, 2011 / 65 / EC (RoHS), 2014 / 30 / EU (EMC), 2014 / 35 / EU (LVD)
REACH:
REACH compliant
RoHS:
RoHS compliant
Other
Short Description:
Actuator, Ø 24,5 mm, Mushroom-head, Non illuminated, Yellow, Plastic, opaque, Round, Black, Plastic, 1 NC / 1 NO, Momentary, Soldering terminal, IP65, according to DIN EN 60529
Housing colour:
Black
Hints:
If the anti-twist ring is not used the panel thickness increases to 4 mm
max. number of switching elements:
2
Wiring diagrams:
Wiring diagrams
Mounting cut-outs:
Mounting cut-outs
Dimension drawings:
Dimension drawings
Download files
Add to Cart
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