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Motor Circuit Protection Selection
Motor Circuit Protectors
Class614
www.se.com/us
Motor Circuit Protection Selection
PowerPacT H- and J-frame electronic Motor Circuit Protectors (MCP) are magnetic-only instantaneous-trip circuit breakers. They are designed to offer short circuit protection and are National Electrical Code (NEC) compliant when installed as part of a combination controller having motor overload protection. MCP circuit breakers accept the same accessories and terminals as the equivalent thermal-magnetic circuit breakers. Determine the hp rating from the nameplate of the motor. Select a MCP with an ampere rating recommended for the hp and voltage involved. When using the automatic settings the MCP microprocessor automatically adjusts the trip settings for both current and time to align with the start-up characteristic for the motor type, whether it is a standard or energy-efficient motor. This includes a dampening means to accommodate a transient motor in-rush current without nuisance tripping of the circuit breaker. Table 7.94: H- and J-Frame Electronic Motor Circuit Protectors (MCP)
J (SeeSCCR Cat. No. Table Below) HJL36030 M71 HJL36050 M72 HJL36100 M73 HJL36150 M74 JJL36250 M75
L (SeeSCCR Cat.No. Table Below) HLL36030 M71 HLL36050 M72 HJL36100 M73 HLL36150 M74 JLL36250 M75
R (SeeSCCR Cat. No. Table Below)
Adjustable Instantane ousTrip Range
Full Load Amperes Range
Sensor Rating
Frame
Suffix
FLA MCP M71
In=30A
Im= 9 - 325A
30 A 1.5–25 A 9–325 A M71
HRL36030M71
Im xFLA
Motor Type/ Tipo de Motor / Type de Moteur
Auto NEMA
IEC
Type/Tipo
Manual/Manuel
10X
8X 9X
8 11 14
Manual/Manuel
1
A,B,C,D
N
Standard
11X
6
17
6X
25 20
2
12X
3
50 A 14–42 A 84–546 A M72
HRL36050M72
2
B,E
H
Energy Ecient
1
1.5
13X
Energy Ecace Energia Eciente Énergie Ecace Energía Eciente
H-Frame
Auto
Auto
HRL36100M73
100 A 30–80 A 180–1040 A M73
150 A 58–130 A 348–1690 A M74
HRL36150M74
J-Frame 250 A 114–217 A 684–2500 A M75
JRL36250M75
t
Table 7.95: Maximum Rating or Setting of Motor Protective Devices [15] Type of Motor Percentage of Full-load Current Setting Not to Exceed [16] A, B,C, D Standard 800% 1300% B, E Energy Efficient 1100% 1700% Table 7.96: MCP Selection by HP Ratings [17] of Induction-type Squirrel-Cage and Wound-Rotor Motors [18] 3Ø60 Hz Voltages [19]
I
Motor Type / Tipo de Motor / Type de Moteur
Standard
Energy Efficient Energie Efficace Energia Eficiente
Full-Load Amperes 1.5–25 14–42 30–80 58–130 114–217
Suffix
200Vac
230Vac .5–7.5
460Vac .75–15 10–30 25–60 50–100 100–150
575Vac 1–20 15–40 30–75 60–125 125–200
.5–5 5–10 10–25 20–40 40–60
M71 M72 M73 M74 M75
5–15 15–30 25–50 50–75
Short Circuit Current Rating (SCCR) Tested to meet NEC and UL508A requirements for short circuit current ratings as part of an approved combination controller. Table 7.97: Short Circuit Current Ratings (SCCR)
Interrupting Rating
Contactor/Starter
J L 200–240 Vac 480 Vac 600 Vac 200–240 Vac 480 Vac 600 Vac
Tesys D-line and F-line
100kA 100kA
65kA 65kA
25kA 25kA
125kA 125kA
100kA 100kA
50kA
NEMATypeS 50kA See www.us.schneider-electric.us for specific ratings and combination ID numbers. To select combination starters and motor controllers using MCP’s Meeting NEC Article 430, refer to Section 16.
Accessories see page 7-55 Lugs see page 7-60 Dimensions see page 7-85 Enclosures see page 7-86
H-, J-Frame Motor Circuit Protectors Table 7.98: Application of PowerPacT™ H-Frame and J-Frame Electronic Motor Circuit Protectors (MCP) Horsepower Rating of Induction-Type Squirrel-Cage and Wound-Rotor Motors 3Ø 60 Hz NEC Full Load Amperes
PowerPacT H-Frame and J-Frame Electronic MCP
Starter Size
200Vac
230Vac
480Vac
575Vac
1/2
0.9A 1.1A 1.3A 1.7A
HJL36030M71 and HLL36030M71 1/2–10hp
1/2
00
3/4
3/4
1
[15] Based on 2015 NEC Table 430.52. [16] See NEC Exception No. 1 to Table 430.52. The NEC 1300% maximum setting may be inadequate for instantaneous trip circuit breakers to withstand current surges typical of the magnetization current of autotransformer type reduced voltage starters, or open transition wye-delta starters during transfer from “start” to “run,” constant hp multi-speed motors, and motors labeled “high efficiency.” [17] Based on 2005 NEC Table 430.250. [18] Per NEC 430.3, part-winding motors should select two circuit breakers, each at not more than one-half the allowable trip setting for the horsepower rating. The two circuit breakers should operate simultaneously as a disconnecting means per NEC 430.103. [19] Listed voltages are rated motor voltages. Corresponding system voltages are 200 Vac, 220–240 Vac, 440–480 Vac and 550–600 Vac. Select wire and circuit breakers based on horsepower rather than nameplate full-load current per NEC 430.6 (A) for general motor applications.
CIRCUIT BREAKERS
7 MINIATURE AND MOLDED CASE
7-53
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