8

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.)

1NC/1NO Contact (Slow-action)

2NC Contact (Slow-action)

Contact Form

Note: Terminal numbers are according to EN50013; contact symbols are according to IEC60947-5-1.

A

B

1. When contact welding 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

(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 (NO)

Contact spring

Return spring

Fixed contact (NC)

Movable contact

Plunger

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.

Model

Contact

Contact form

Diagrams

Explanation

D4B-

@1@N

1NC/1NO

(Snap-action)

D4B-

@5@N

1NC/1NO

(Slow-action)

D4B-

@A@N

2NC

(Slow-action)

13

14

11

12

Za

11-12

13-14

Stroke

ON

Only NC contact 11-12 has a

certified direct opening

mechanism.

Terminal numbers 11-12 and

13-14 cannot be used as unlike

poles.

11

23

12

24

Zb

11-12

23-24

Stroke

ON

Only NC contact 11-12 has a

certified 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 a certified direct

opening mechanism.

Terminal numbers 11-12 and

21-22 can be used as unlike

poles.