5
Instruction Leaet IL16960
Effective May 2011
EATON CORPORATION www.eaton.com
A201, A211, A251, Size 00, 0 or 1 Magnetic
Contactor Nonreversing or Reversing
MAINTENANCE - First Turn Off Power
To Inspect Contacts
Refer to Figure 9. Loosen the two arc box assembly screws (7)
located immediately above and below the nameplate and remove
the arc box (8). Contacts (5) are visible. Retighten the screws per
Table III.
To Replace Contacts
After removing the arc box and with replacement contacts at hand,
compress the overtravel spring (12) and remove the moving contact
(5) from the crossbar (6). Disconnect any power cables. Remove the
retaining screw (11) and lift out the stationary contact assembly (14).
To replace contacts, reverse the above procedure, making sure that
stationary contacts are secure (see Table III), moving contacts are
free to move, overtravel springs are seated and the crossbar moves
freely when the arc box is in position.
The silver cadmium oxide contact buttons need NO dressing or
lubricant throughout their life. Important - Replace all contacts and
springs as a group to avoid misalignment.
To Replace The Coil
Refer to Figure 9. Loosen the assembly screws (10) located to the
immediate top and bottom of the arc box. Pull the loosened upper
base structure (9) forward. Pull the coil (1) from the upper base,
plug in a new coil, replace the upper base structure and check the
auxiliary contacts for secureness when repositioning the upper base.
Tighten the assembly screws referring to Table III.
Magnet - Armature Assembly
Self alignment and permanent air gap features of the magnet
armature make replacement unnecessary. Mating pole face surfaces
should be kept clean.
Arc box must be in place when the contactor interrupts a circuit.
Figure 9. A201 Magnetic Contactor (Exploded view)
