Beckwith Electronics

Hamburg, Illinois 62045
(618) 232-1139

(618) 232-1172 fax

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EAO Switch


Series 51
Two and three position keylocks

Features:
250 VAC/5A, 220 VDC/0.1A, 24 VDC/2A snap action 42 VAC/0.1A, 42 VDC/0.1A low level
Minimum depth: 1.00"
Meets IP 65 and NEMA 4 and 13 specifications
Minature keylock switch
Anti-static
High security key available



 
51-910 Anti-rotation
locking washer supplied

Series 51 keylocks are supplied with an anti-rotation locking washer which allows the switch to be mounted in round drilled holes. The anti-rotation washer prevents rotation when properly tightened.

To order:Select keylock switch element and key removable positions plus contact material, termination, and lock type, when applicable.

Two Position Keylock Part Numbers    

Keylock Function
and Switch
Element
Key
Removable
Rectangular Square Round
Momentary
Snap Action
1-pole Form Z A 51-495.022D
51-495.025D
51-495.022D
51-495.025D
51-495.022K
51-495.025K
51-495.022K
51-495.025K
51-145.022D
51-145.025D
51-145.022D
51-145.025D
51-145.022K
51-145.025K
51-145.022K
51-145.025K
51-141.022D
51-141.025D
51-141.022D
51-141.025D
51-141.022K
51-141.025K
51-141.022K
51-141.025K
2-pole Form Z A 51-496.025D
51-496.025K
51-146.025D
51-146.025K
51-142.025D
51-142.025K
3-pole Form Z A 51-497.025D
51-497.025K
51-147.025D
51-147.025K
51-143.025D
51-143.025K
4-pole Form Z A 51-498.025D
51-498.025K
51-148.025D
51-148.025K
51-144.025D
51-144.025K
Low Level
2 N.O. contacts A 51-427.036D
51-427.036K
51-457.036D
51-457.036K
51-437.036D
51-437.036K
1 N.O., 1N.C. A 51-428.036D
51-428.036K
51-458.036D
51-458.036K
51-438.036D
51-438.036K
Maintained
Snap Action
1-pole Form Z A & C 51-195.022D
51-195.025D
51-195.022D
51-195.025D
51-195.022K
51-195.025K
51-195.022K
51-195.025K
51-155.022D
51-155.025D
51-155.022D
51-155.025D
51-155.022K
51-155.025K
51-155.022K
51-155.025K
51-135.022D
51-135.025D
51-135.022D
51-135.025D
51-135.022K
51-135.025K
51-135.022K
51-135.025K
A 51-295.022D
51-295.025D
51-295.022D
51-295.025D
51-295.022K
51-295.025K
51-295.022K
51-295.025K
51-255.022D
51-255.025D
51-255.022D
51-255.025D
51-255.022K
51-255.025K
51-255.022K
51-255.025K
51-235.022D
51-235.025D
51-235.022D
51-235.025D
51-235.022K
51-235.025K
51-235.022K
51-235.025K
C 51-395.022D
51-395.025D
51-395.022D
51-395.025D
51-395.022K
51-395.025K
51-395.022K
51-395.025K
51-355.022D
51-355.025D
51-355.022D
51-355.025D
51-355.022K
51-355.025K
51-355.022K
51-355.025K
51-335.022D
51-335.025D
51-335.022D
51-335.025D
51-335.022K
51-335.025K
51-335.022K
51-335.025K
2-pole Form Z A & C 51-196.025D
51-196.025K
51-156.025D
51-156.025K
51-136.025D
51-136.025K
A 51-296.025D
51-296.025K
51-256.025D
51-256.025K
51-236.025D
51-236.025K
C 51-396.025D
51-396.025K
51-356.025D
51-356.025K
51-336.025D
51-336.025K
3-pole Form Z A & C 51-197.025D
51-197.025K
51-157.025D
51-157.025K
51-137.025D
51-137.025K
A 51-297.025D
51-297.025K
51-257.025D
51-257.025K
51-237.025D
51-237.025K
C 51-397.025D
51-397.025K
51-357.025D
51-357.025K
51-337.025D
51-337.025K
4-pole Form Z A & C 51-198.025D
51-198.025K
51-158.025D
51-158.025K
51-138.025D
51-138.025K
A 51-298.025D
51-298.025K
51-258.025D
51-258.025K
51-238.025D
51-238.025K
C 51-398.025D
51-398.025K
51-358.025D
51-358.025K
51-338.025D
51-338.025K
Low Level
2N.O. contacts A & C 51-401.036D
51-401.036K
51-441.036D
51-441.036K
51-411.036D
51-411.036K
A 51-404.036D
51-404.036K
51-444.036D
51-444.036K
51-414.036D
51-414.036K
C 51-407.036D
51-407.036K
51-447.036D
51-447.036K
51-417.036D
51-417.036K
1N.O., 1 N.C. A & C 51-402.036D
51-402.036K
51-442.036D
51-442.036K
51-412.036D
51-412.036K
A 51-405.036D
51-405.036K
51-445.036D
51-445.036K
51-415.036D
51-415.036K
C 51-408.036D
51-408.036K
51-448.036D
51-448.036K
51-418.036D
51-418.036K
Select terminal type and lock type digits where applicable 0.2
1st digit is always 0 (Case color is black)
Contact material(2nd digit):2=Gold over silver
Note: Snap Action silver contacts are available on special request.
Terminal type (3rd digit):2=0.110"Q.C., 5=Solder
Lock type (4th digit): D= Standard lock, K= High security lock.

Position A - Does not actuate either switch #1 or #2.
Position B - Actuates switch #1 only.
Position C - Actuates switch #2 only.

Three-Position Keylock Part Numbers
Includes switch contact block
Add lock digit
Position Configuration
A. B.
C. or
Function Key
Removeable
Bezel Fig.
C A B Rectangular Square Round
Maintained C & B   X   51-361.022D
51-361.022K
51-381.022D
51-381.022K
51-371.022D
51-371.022K
A
Maintained C & B X X X 51-362.022D
51-362.022K
51-382.022D
51-382.022K
51-372.022D
51-372.022K
A
Maintained C & B X   X 51-363.022D
51-363.022K
51-383.022D
51-383.022K
51-373.022D
51-373.022K
A
Momentary C & B   X   51-364.022D
51-364.022K
51-384.022D
51-384.022K
51-374.022D
51-374.022K
B
Maintained C
Momentary B
X X   51-366.022D
51-366.022K
51-386.022D
51-386.022K
51-376.022D
51-376.022K
C
  X   51-365.022D
51-365.022K
51-385.022D
51-385.022K
51-375.022D
51-375.022K
Maintained B
Momentary C
  X   51-367.022D
51-367.022K
51-387.022D
51-387.022K
51-377.022D
51-377.022K
C
  X X 51-368.022D
51-368.022K
51-388.022D
51-388.022K
51-378.022D
51-378.022K


Keylock Types

There is a choice of two keylock mechanisms: the standard five tumbler (D) or the eight tumbler high security (K). Adding the appropriate suffix letter to the part number defines the lock type. If no suffix number is indicated, they keylock switch will be supplied with the standard D-type lock. Two keys are supplied with each keylock.

Suffix Lock Description
D Standard Five tumbler lock mechanism with cut key. Key code 311 is the standard stocking item. There are 134 other key codes available on request and a master key is available.
Spare key part number: 31-989.
(Please state 3 digit key code.)
K High
Security
Eight tumbler lock mechanism uses a flat key. Two-position keylocks use key code 1001 as a standard stocking item. An additional 690 key codes may be requested, and a master key is available. Three-position keylocks use key code 4001 as a standard stocking item. There are an additional 311 key codes available on request.No master key is available.
Spare key part number:14-987.
(Please specify 4 digit key code.)




Application Note
Two Independently wired Form Z
contacts actuated by different key
positions.
Series 51 low level switches
with mating connector
mounted on a printed
circuit board.
Leg A-B controls "off-On." Leg A-C controls
the momentary "Reset" without affecting the
A-B circuit. Design is similar to a car
ignition/start switch; the ignition coil remains
on during actuation of the starter.