Table 17 . Pre-Inspection Conditions; Table 18 . Magnum And Pd-Sb Breaker Torque List; Table 19 . Greases Used On Magnum And Pd-Sb; Figure 79. Use Of Contact Wear Indicator With Circuit Breaker Closed - Eaton Magnum PXR User Manual

Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
Side-to-side
ledge
Contact wear indicator—
contacts closed and in good condition

Figure 79. Use of contact wear indicator with circuit breaker closed

Internal mechanism inspection
Table 17. Pre-inspection conditions
Device Position of poles
Fixed Open
Drawout Open
Procedure
1. Inspect the breaker for nicked wires, cracks in plastic parts,
and loose screws . Screws or bolts should be tightened to levels
outlined in Table 18 . Loose screws inserted into plastic parts will
require thread-locking compound (such as Loctite 242) .
All nicked wiring should be replaced or repaired in accordance
with accepted industry practices .
2. Ensure that the torque values of the operating mechanism
and motor mounting hardware are within the recommended
values in Table 14 .
3. Inspect all sliding or rolling parts for cleanliness and adequate
lubrication . Refer to Table 19 and Figure 80—Figure 85 .
Table 18. Magnum PXR and PD-SB breaker torque list
Subassembly lb-in
Arc chute 35–45
Front cover 25–35
Rear housing 75–85
Motor operator 75–85
Current sensor cover screws 18–22
Fixed mount feet bolts 75–85
Primary disconnect 75–85
Contact wear
inspection area
(ledge not visible
under contacts)
Mechanism
Closed Charged
Closed Charged
Nm
3.95–5.08
2.82–3.95
8.47–9.60
8.47–9.60
2.03–2.49
8.47–9.60
8.47–9.60
(ledge NOW becoming visible
Contact wear indicator—
contacts closed and wear is indicated
Device position in cassette
Discharged —
Discharged Connected
Table 19. Greases used on Magnum PXR and PD-SB
Grease type
Magnalube -G
®
Eaton standards
Color
Manufactured by
Molykote
®
Eaton standards
Color
Manufactured by
User Manual MN013016EN
Effective July 2022
Contact wear
inspection area
under contacts)
— —
Test Disconnected
Description
#53701AI
Green
Saunders Enterprises inc.
11-51 44th Road, Long Island City, New York 11101
Phone (718) 729-1000
Fax (718) 729-2690
www.magnalube.com
#53701QB
Black
Dow Corning Company
Midland, Michigan 48686-0994
(989) 636-1000
www.dupont.com/molykote.html
EATON www.eaton.com
Side-to-side
ledge
—
Removed
49