G-248
Safety Sensors / Components
Contact Form (EN50013)
Direct Opening Mechanism
1NO/1NC Contact (Snap-action)
If metal deposition between mating contacts occurs on the NC contact side, they can be pulled apart by the shearing force and tensile force gen-
erated when part B of the safety cam or plunger engages part A of the movable contact blade. When the safety cam or plunger is moved in the
direction of the arrow, the Limit Switch releases.
1NC/1NO Contact (Slow-action)
2NC Contact (Slow-action)
Model
Contact
Diagrams
Explanation
D4B-
#
1
#
N
1NC/1NO
(Snap-action)
D4B-
#
5
#
N
1NC/1NO
(Slow-action)
D4B-
#
A
#
N
2NC
(Slow-action)
13
11
14
12
Za
11-12
13-14
Stroke
ON
Only NC contact 11-12 has an
approved direct opening
mechanism.
Terminal numbers 11-12 and
13-14 cannot be used as unlike
poles.
11
12
23
24
Zb
11-12
23-24
Stroke
ON
Only NC contact 11-12 has an
approved direct opening
mechanism.
Terminal numbers 11-12 or
23-24 can be used as unlike
poles.
11
21
12
22
Zb
11-12
21-22
Stroke
ON
Both NC contacts 11-12 and
21-22 have an approved direct
opening mechanism.
Terminal numbers 11-12 and
21-22 can be used as unlike
poles.
A
B
1. When metal deposition occurs.
2. When contacts are being pulled apart.
Movable contact
Plunger
Safety cam
Fixed contact (NC)
Movable contact
blade
Safety cam directly
pushes up the
movable contact
blade.
3. When contacts are completely
pulled apart.
Contact spring
Return spring
Fixed contact (NC)
Movable contact
Plunger
Conforms to EN60947-5-1 Direct Opening
When metal deposition occurs, the contacts
are separated from each other by the plunger
being pushed in.
Fixed contact (NO)
Contact spring
Return spring
Fixed contact (NC)
Movable contact
Plunger
Conforms to EN60947-5-1
When metal deposition occurs, the contacts
are separated from each other by the plunger
being pushed in.
is marked on the product to indicate ap-
proval of direct opening.
F502-EN2-04.book Seite 248 Dienstag, 26. Juli 2005 5:48 17
