Install Instructions

DESCRIPTION
The fuse block, catalog number 49MAFB4, shown in Figure 1 is
used for the control fuses that provide overcurrent protection for
the control transformer primary windings. This fuse block
accommodates two rejection type fuses.
The fuse blocks, catalog numbers 49MAFB1 (for one fuse) and
49MAFB2 (for two fuses), are for control transformer secondary
fuses. These fuse blocks accept
13
/
32 diameter by 1
1
/
2 inch long
fuses.
Figure 2 shows a typical motor starter circuit with control and
secondary fuses. The fuses are not furnished with the fuse
blocks.
Use with combination starters of all sizes in all NEMA type
enclosures.
Rating: 30 amp. 600 volt maximum.
Contents of kits, catalog numbers 49MAFB1, 49MAFB2, and
49MAFB4:
Each kit contains the applicable fuse block plus two size 8-32
machine screws.
INSTALLATION
The enclosure panel contains predrilled and tapped holes for
mounting several control accessories. Each fuse block requires
two size 8-32UNF-2A tapped holes. The horizontal distance
between holes is
3
/8
inch for a block that accommodates one
fuse,
3
/4 inch for a block that holds two fuses. Locate the holes
on the enclosure panel or choose a suitable location and drill
and tap mounting holes.
1. Secure the fuse block to the panel with the two screws pro-
vided. Position the rejection type fuse block with the red
clips at the bottom for proper fuse orientation.
2. When making connections to the fuse terminals, tighten ter-
minals screws to 18 inch pounds minimum torque.
3. Select the proper fuse size in accordance with current
National Electrical Code requirements.
Instructions
December, 1999
Supersedes Issue of
March, 1984
Siemens Energy & Automation, Inc. 1000 McKee Street Batavia, Illinois 60510
49-HMAFB1
Fuse Block
Panel Mounting 30 Amp. Maximum
Class 17, 18, 25, 26, 32, 36, & 37
Cat. No. 49MAFB1, 2, & 4
Hazardous voltage.
Can cause death, serious personal
injury, or property damage.
Disconnect power before working on
this equipment.
Figure 1
1 Fuse Block 49MAFB4 (Control fuses not included)
2 Fuse Block 49MAFB1 (Secondary fuse not included)
Figure 2
(For Engineering Reference Only - Rev. C)