Safety Limit Switch

D4B-[]N

Robust safety limit switch with metal housing Slow-action and snap-action contact with certified direct opening operation certification.

Set Model Numbers

Consult with your OMRON representative when ordering any models that are not listed in this table. 

Safety Limit Switches (with Direct Opening Mechanism)

Actuator

Conduit
 openings

1NC/1NO (Snap-action)

1NC/1NO (Slow-action)

2NC (Slow-action)

Model

Direct
 opening

Model

Direct
 opening

Model

Direct
 opening

Roller lever
 (resin roller)

 image

G1/2 (PF1/2)

D4B-2111N

image

D4B-2511N

image

D4B-2A11N

image

M20

D4B-4111N

D4B-4511N

D4B-4A11N

Roller lever
 (stainless steel roller)

image

G1/2 (PF1/2)

D4B-2115N

image

D4B-2515N

image

D4B-2A15N

image

M20

D4B-4115N

D4B-4515N

D4B-4A15N

Plunger

image

G1/2 (PF1/2)

D4B-2170N

image

D4B-2570N

image

D4B-2A70N

image

M20

D4B-4170N

D4B-4570N

D4B-4A70N

Roller plunger

image

G1/2 (PF1/2)

D4B-2171N

image

D4B-2571N

image

D4B-2A71N

image

M20

D4B-4171N

D4B-4571N

D4B-4A71N

General-purpose Limit Switches

Actuator

Conduit
 openings

1NC/1NO (Snap-action)

1NC/1NO (Slow-action)

2NC (Slow-action)

Model

Direct
 opening

Model

Direct
 opening

Model

Direct
 opening

Adjustable
 roller lever

image

G1/2 (PF1/2)

D4B-2116N

---

D4B-2516N

---

D4B-2A16N

---

M20

D4B-4116N

D4B-4516N

D4B-4A16N

Adjustable
 rod lever

image

G1/2 (PF1/2)

D4B-2117N

---

D4B-2517N

---

D4B-2A17N

---

M20

D4B-4117N

D4B-4517N

D4B-4A17N

Note: Consult your OMRON representative for products.