D4B-@N
Direct Opening Mechanism
1NO/1NC Contact (Snap-action)
Conforms to EN60947-5-1 Direct Opening
(Only NC contact has a direct opening mechanism.)
1. When contact welding occurs.
2. When contacts are being pulled apart.
3. When contacts are completely
pulled apart.
Movable contact
Safety cam directly
pushes up the
movable contact
blade.
Movable contact
blade
Plunger
A
B
Safety cam
Fixed contact (NC)
1NC/1NO Contact (Slow-action)
2NC Contact (Slow-action)
Conforms to EN60947-5-1 Direct Opening
Conforms to EN60947-5-1 Direct Opening
(Both NC contacts have a direct opening mechanism.)
When contact welding occurs, the contacts are separated
from each other by the plunger being pushed in.
(Only NC contact has a direct opening mechanism.)
When contact welding occurs, the contacts are separated
from each other by the plunger being pushed in.
Fixed contact (NC)
Fixed contact (NC)
Movable contact
Plunger
Contact spring
Contact spring
Return spring
Movable contact
Plunger
Return spring
Fixed contact (NO)
Contact Form
Model
Contact
Contact form
Diagrams
Explanation
Only NC contact 11-12 has a
certified direct opening
mechanism.
Za
11-12
13-14
13
14
12
ON
1NC/1NO
(Snap-action)
D4B-@1@N
Terminal numbers 11-12 and
13-14 cannot be used as unlike
poles.
Stroke
11
Only NC contact 11-12 has a
certified direct opening
mechanism.
Zb
11-12
23-24
11
23
12
24
1NC/1NO
(Slow-action)
ON
D4B-@5@N
D4B-@A@N
Terminal numbers 11-12 or
23-24 can be used as unlike
poles.
Stroke
Both NC contacts 11-12 and
21-22 have a certified direct
opening mechanism.
Zb
11-12
21-22
11
21
12
22
2NC
(Slow-action)
ON
Terminal numbers 11-12 and
21-22 can be used as unlike
poles.
Stroke
Note: Terminal numbers are according to EN50013; contact symbols are according to IEC60947-5-1.
8
OMRON [ OMRON ELECTRONICS LLC ]
