MS21437H
Monitoring circuit: Monitoring equipment shall provide a record of the number of cycles and shall record failures or discontinue the test if a failure occurs. Each contact closure shall be monitored.
Part or Identifying Number (PIN): Example:
Locking configuration letter: (see table I and figure 2)
Dash number: (see table 1)
MS21437- F 841
PIN MS21437-F841 identifies a switch with lever locking configuration F, locked (on) in center position, momentary
(on) both sides, with method I toggle lever seal.
TABLE I. Switching characteristics.
PIN 1/ 2/ MS21437 |
Available locking configurations |
Circuits made between terminals as indicated with the toggle lever in these positions: |
|||
Opposite keyway side |
Center position |
Keyway side |
|||
-711 |
-211 |
A, B, D |
On 2-3, 5-6 |
Off |
On 1-2, 4-5 |
-721 |
-221 |
C, E |
None |
Off |
|
-731 |
-231 |
On 1-2, 4-5 |
|||
-741 |
-241 |
J, B |
Off |
None |
|
-811 |
-311 |
G, K, L |
Mom-on 1-2, 4-5 |
||
-821 3/ |
-321 3/ |
K |
None |
On 2-3, 5-6 |
Mom-on 1-2, 4-5 |
-831 3/ |
-331 3/ |
A, B, C, D |
On 2-3, 5-6 |
On 1-2, 4-5 |
|
-841 3/ |
-341 3/ |
F, H |
Mom-on 2-3, 5-6 |
Mom-on 1-2, 4-5 |
|
-851 3/ |
-351 3/ |
G, K, L |
|||
-881 |
-381 |
K |
None |
Off |
|
-871 |
-371 |
F, H |
Mom-on 2-3, 5-6 |
Off |
|
1/ Series 700 and 800 dash numbers have method I toggle seal (15 foot head of water). Series 200 and 300 dash numbers have method II toggle seal (0.5 inch head of water).
2/ PIN's MS21437-771, -781, -271 and -281 have been canceled and replaced by
MS21437-871, -881, -371 and -381 respectively.
3/ For center-on circuits, delayed action of the toggle lever may cause circuit to close or open before snap action mechanism trips.
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