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Safety Limit Switch [D4B-□N] (D4B-2A71N)

Robust safety limit switch with metallic housing. Direct opening mechanism in both of slow action type, and snap action type

[Features]
· Direct opening mechanism (only at NC contact side) to separate contact at the time of fault in contact welding.
· Safety of lever setting is achieved by using operation position display board and mechanism by which lever is interlocked.
· Proper operation zone display mechanism is also available.
· Moreover, changing of direction of lateral movement is also by one-touch.
· Improvement in sealing property by strengthening the seal structure of head part (meets TÜ V: IECIP67, UL: NEMA3, 4, 4X, 6P,13).
· Wide available temperature range of - 40 to +80°C.
· Approved by UL, CSA, EN(TÜV), CCC

Part Number

Configured Part Number is shown.

D4B-2A71N

Product Specifications
Part Numbers
Catalog

Dimensional Drawing of OMRON Limit Switch

Safety Limit Switch D4B-□N External dimensions-1

Safety limit switch D4B-□N External dimensions-2

Note: The dimensional tolerance of the parts not specified in the above external dimension diagrams for each model is ±0.4 mm.
*1. The lever can be fixed at any position by inverting the set position indicator plate.
*2. In terms of mechanism, it is not a safety Limit Switch but a general Limit Switch.

Specification Table of OMRON Limit Switch

Limit Switch structure

Safety limit switch D4B-□N structure diagram

Limit Switch Performance

Protective structure*1		IP67 (EN60947-5-1)
Durability*2	Mechanical	Over 30 million times (snap action) Over 10 million times (slow action)
Durability*2	Limit Switch Electrical	Over 500,000 times (AC250V 10A resistive load)
Allowable Operating Speed		1mm to 0.5m/s
Allowable operating frequency	Mechanical	120 times/min
Allowable operating frequency	Limit Switch Electrical	30 times/min
Contact Resistance		25mΩ or less
Minimum applicable load*3		DC5V 180mA Resistive load (N level reference value)
Rated insulation voltage (Ui)		600V (EN60947-5-1)
Rated Frequency		50/60Hz
Electric shock protection class		Class I (with earth terminal)
Pollution level (usage environment)		Pollution degree 3 (EN60947-5-1)
Impulse withstand voltage (EN60947-5-1)	Between same-polarity terminals	2.5kV (snap action)/4kV (slow action)
	Between different terminals	4kV (slow action)
	Between each terminal and earth	4kV
Insulation resistance		Between Limit Switch of the same polarity, and between terminals and non-current-carrying metal parts: 100MΩ or more (at 500V DC)
Contact Gap		Min. 2 x 2mm (slow action) Min. 2 x 0.5mm (snap action)
vibration	malfunction	10 to 55Hz, single amplitude 0.75mm
impact	Durability	1,000m/s2 or^more
impact	malfunction	300m/s2 or^more
Conditional Short Circuit Current		100A (EN60947-5-1)
Rated sealed thermal current (Ithe)		20A (EN60947-5-1)
Ambient temperature		-40 to +80℃ (but do not freeze)
Ambient humidity		95% RH or less
mass		Approx. 250g

Note 1. The above values are initial values.
2. The above values may differ depending on the model.
*1. This protection structure is based on a test method based on the standard (EN60947-5-1), so please check the sealing performance in the actual environment and conditions of use in advance.
*2. The durability conditions are for an ambient temperature of 5 to 35°C and an ambient humidity of 40 to 70% RH.
*3. This value may vary depending on the Limit Switch frequency, environmental conditions, reliability level, etc. Please check with the actual load in advance.

: 30; 45; 60

Part Number
D4B-2A71N

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Detector Shape	Environment	Plunger Shape Type	Roller Lever Shape Type	Lever Shape Type	Acquired Standards	Force Required for Push Side O.F. (N)	Motion to Switching P.T. (mm)	Angle to Switching P.T (deg)	Max. Stroke T.T (mm)	Max. Angle T.T (deg)	Contact Type	Mechanical Life (10,000 times)	Rated Operating Voltage (V)	Rated Conductance Current (A)	Main Body External Dimension, Width W (mm)	Main Body External Dimension, Height H (mm)	Main Body External Dimension, Length L (mm)	Lever Length R (mm)	Detector Element Details	Movement After the Operation OT (mm)	Operating Position OP (mm)	Conduit Size	Specification of Terminal	Details Type	O.D.	Mounting System	Direction of Operation	Roller Type	Contact format	Built-in Switch Specification	Note
	MYR 337.51	1 Piece(s)		5 Day(s) or more	Plunger Type	Standard / Cold Resistance	[Roller Plungers] Roller Plunger	-	The Horizontal one way roller	TUV / UL / C-UL / CE / GB(CCC) / CQC / CSA / EN	18.63	2	-	7	-	Mutual insulation double-throw	1000	DC30V or Less / DC125V / DC250V / AC100/125V / AC240/250V / More than AC300V	10	40	43	97	-	Top roller plunger type	5	48±1	G1/2 (PF1/2)	Ground terminal included	1 Conduit Shape	φ12.7×4.8	Front mounting	Slow action	Stainless Steel Sintering Roller	2NC	2NC contact (slow-action)	-

Product TOP

Basic Information

Main Body Size	Standard	Operating Temperature Range(°C)	-40::80	Protection Structure	IP67
Mechanical Operation Frequency(times/min or Less)	120	AC Rated Voltage	125 / 250 / 400	DC Rated Voltage	8 / 14 / 30 / 125 / 250

Please check the type/dimensions/specifications of the part D4B-2A71N in the Safety Limit Switch [D4B-□N] series.

Configure

1 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Environment
- Standard
- Cold Resistance
Clear
Roller Lever Shape Type
- Standard
- Variable Roller Levers
Clear
Rated Operating Voltage(V)
- DC30V or Less
- DC125V
- DC250V
- AC100/125V
- AC240/250V
- More than AC300V
Clear
type
- D4B-□N
Clear
Detector Shape
- Plunger Type
- Roller Lever Type (rotation)
- Roller lever type
Clear
Plunger Shape Type
- Roller Plungers
  - Roller Plunger
- Push Plunger
Clear
Lever Shape Type
- The Horizontal one way roller
Clear
Force Required for Push Side O.F.(N)
9.41

18.63
Clear
Contact Type
- Mutual insulation double-throw
- 2-circuit Double-break
Clear
Rated Conductance Current(A)
10
Clear
Detector Element Details
- Roller lever type (resin roller)
- Roller lever type (stainless steel roller)
- Top plunger type
- Top roller plunger type
- Variable rod lever type
- Variable roller lever type
Clear
Movement After the Operation OT(mm)
5
Clear
Operating Position OP(mm)
- 35±1
- 48±1
Clear
Conduit Size
G1/2 (PF1/2)

M20
Clear
Specification of Terminal
Ground terminal included
Clear
Details Type
- 1-conduit type
- 1 Conduit Shape
Clear
O.D.
- φ9.2
- φ12.7×4.8
- φ17.5×6.6
- φ17.5×7
- φ19×7
Clear
Mounting System
Front mounting
Clear
Direction of Operation
Slow action

Snap Action
Clear
Roller Type
- Plastic Rollers
- Stainless Steel Roller
- Stainless Steel Sintering Roller
Clear
Contact format
- 1NC/1NO
- 2NC
Clear
Built-in Switch Specification
- 1NC/1NO contact (slow-action)
- 1NC/1NO contact (snap-action)
- 2NC contact (slow-action)
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

1 Day(s) or Less

2 Day(s) or Less

5 Day(s) or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

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D4B-4117N

Standard Unit Price	Minimum order quantity	Days to Ship	Detector Shape	Environment	Plunger Shape Type	Roller Lever Shape Type	Lever Shape Type	Acquired Standards	Force Required for Push Side O.F. (N)	Motion to Switching P.T. (mm)	Angle to Switching P.T (deg)	Max. Stroke T.T (mm)	Max. Angle T.T (deg)	Contact Type	Mechanical Life (10,000 times)	Rated Operating Voltage (V)	Rated Conductance Current (A)	Main Body External Dimension, Width W (mm)	Main Body External Dimension, Height H (mm)	Main Body External Dimension, Length L (mm)	Lever Length R (mm)	Detector Element Details	Movement After the Operation OT (mm)	Operating Position OP (mm)	Conduit Size	Specification of Terminal	Details Type	O.D.	Mounting System	Direction of Operation	Roller Type	Contact format	Built-in Switch Specification	Note
MYR 342.61	1 Piece(s)	5 Day(s) or more	Roller lever type	Standard	-	-	-	CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	-	-	-	-	-	-	3000	-	10	-	-	-	-	Variable rod lever type	-	-	G1/2 (PF1/2)	-	1-conduit type	-	-	-	-	-	1NC/1NO contact (snap-action)	BY JPN
MYR 221.50	1 Piece(s)	5 Day(s) or more	Plunger Type	Standard / Cold Resistance	Push Plunger	-	-	CQC / CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	18.63	2	-	7	-	2-circuit Double-break	3000	DC250V / DC125V / AC100/125V / DC30V or Less / More than AC300V / AC240/250V	10	40	43	97	-	Top plunger type	5	35±1	G1/2 (PF1/2)	Ground terminal included	1 Conduit Shape	φ9.2	Front mounting	Snap Action	-	1NC/1NO	1NC/1NO contact (snap-action)	-
MYR 252.47	1 Piece(s)	1 Day(s)	Plunger Type	Standard / Cold Resistance	[Roller Plungers] Roller Plunger	-	The Horizontal one way roller	CQC / CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	18.63	2	-	7	-	2-circuit Double-break	3000	DC250V / DC125V / AC100/125V / DC30V or Less / More than AC300V / AC240/250V	10	40	43	97	-	Top roller plunger type	5	48±1	G1/2 (PF1/2)	Ground terminal included	1 Conduit Shape	φ12.7×4.8	Front mounting	Snap Action	Stainless Steel Sintering Roller	1NC/1NO	1NC/1NO contact (snap-action)	-
MYR 339.81	1 Piece(s)	5 Day(s) or more	Roller lever type	Standard	-	-	-	CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	-	-	-	-	-	-	3000	-	10	-	-	-	-	Roller lever type (stainless steel roller)	-	-	M20	-	1-conduit type	-	-	-	-	-	1NC/1NO contact (snap-action)	-
MYR 275.64	1 Piece(s)	5 Day(s) or more	Roller Lever Type (rotation)	Standard / Cold Resistance	-	Variable Roller Levers	-	CQC / CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	9.41	-	21±3°	-	75	2-circuit Double-break	3000	DC250V / DC125V / AC100/125V / DC30V or Less / More than AC300V / AC240/250V	10	40	43	99.5	25-89	Variable roller lever type	-	-	M20	Ground terminal included	1 Conduit Shape	φ19×7	Front mounting	Snap Action	Plastic Rollers	1NC/1NO	1NC/1NO contact (snap-action)	-
MYR 277.05	1 Piece(s)	5 Day(s) or more	Roller lever type	Standard	-	-	-	CSA / EN / UL / C-UL / CE / GB(CCC) / TUV	-	-	-	-	-	-	3000	-	10	-	-	-	-	Variable rod lever type	-	-	M20	-	1-conduit type	-	-	-	-	-	1NC/1NO contact (snap-action)	-

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How can we improve?

Safety Limit Switch [D4B-□N] (D4B-2A71N)

Dimensional Drawing of OMRON Limit Switch

Specification Table of OMRON Limit Switch

Limit Switch structure

Limit Switch Performance

Basic Information

Configure

Specification/Dimensions

Environment

Roller Lever Shape Type

Rated Operating Voltage(V)

type

Detector Shape

Plunger Shape Type

Lever Shape Type

Force Required for Push Side O.F.(N)

Contact Type

Rated Conductance Current(A)

Detector Element Details

Movement After the Operation OT(mm)

Operating Position OP(mm)

Conduit Size

Specification of Terminal

Details Type

O.D.

Mounting System

Direction of Operation

Roller Type

Contact format

Built-in Switch Specification

CAD

Days to Ship

Specify Alterations

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