4
40752-195 (1)
Effective
2
/201
1
This instruction leaflet gives procedures for installation
and field testing of N-frame circuit breakers and describes
the different trip unit characteristics. For this publication,
the term circuit breaker shall also include the molded case
switch.
2.
INSTALLATION
The installation procedure consists of inspecting the circuit
breaker, installing the accessories and terminals and, if
required, mounting the circuit breaker, connecting the line
and load conductors and accessory wiring, and adjusting
trip settings. Circuit breakers, accessories, and terminals.
may be supplied in separate packages. To install the circuit
breaker, perform the following steps:
2.1 Inspection
Make sure the circuit breaker is suitable for the intended
installation by comparing nameplate date with existing
equipment ratings and system requirements. Inspect the
circuit breaker for completeness and check for damage
before mounting.
2.2 Accessory Installation
Note: If required, internal accessory installation in
any type of circuit breaker should be done before the
circuit breaker is mounted and connected. Refer to the
individual accessory instruction leaflets listed above.
Terminals are not included.
Terminals must be purchased separately.
For bus connections use:
M12 - 1.75 bolts for Metric Style front mounted bus
connections, socket cap screws are recommended.
Torque Table (Domestic)
Figure 2-2 Conductor Extensions (Purchased Separately)
Figure 2-1 Terminal Installation
Terminal Cat.
No.
Wire Size
MCM
Cond.
Mat'l
Torq.
Lb.-in.
Torq.
Nm.vv
140U-N-TLA2 #1-500 (2)
CU/AL
375
42.4
140U-N-TLA3 3/0-400 (3)
CU/AL
375
42.4
140U-N-TLA4 4/0-500 (4)
CU/AL
375
42.4
140U-N-TLA3A 500-750 (3)
CU/AL
450
50.9
140U-N-TLC2 2/0-500 (2)
CU ONLY
300
33.9
140U-N-TLC3 3/0-5-- (3)
CU ONLY
300
33.9
140U-N-TL4
3/0-400 (4)
CU ONLY
275
31.1
