Install Instructions
POWER WIRING
Power lugs suitable for copper
conductors only. Sized for 60 °C
wire ampacity, rated 60 °C minimum
or sized for 75 °C wire ampacity,
rated 75 °C minimum.
Lug torque requirements:
line and load: 20 lb-in (2.3 N•m).
3-PHASE, 3-WIRE SYSTEM
MO558M
MOTOR
T3
3
2
1
USER'S
DISCONNECTING MEANS
L2
L1 L3
L1
L2
L3
T3
WIRE
D
* WIRE D OMITTED ON FORM CS
T2
T2
T1
X2
OL
T1
*
OVERLOAD RELAY THERMAL UNITS
For continuous rated motors having service factors of 1.15 to 1.25, select thermal units directly
from table using 100% of full load current (FLC) shown on motor nameplate. For continuous rated
motors having a service factor of 1.0, select thermal units from table using 90% of FLC shown on
motor nameplate.
Branch circuit fuse rating must comply with applicable electrical codes and must not exceed the
maximum fuse rating shown opposite the thermal unit selected. Fuses may need to be of the
time delay type to permit motor starting. Class K5 or Class R fuses are recommended.
Non-time delay fuses whose rating does not exceed 300% of motor FLC may also be used.
Maximum allowable thermal magnetic (inverse time) circuit breaker rating is 225% of motor FLC
unless a lower rating is required by applicable electrical codes. For FLC below 6.67 A, a 15 A
circuit breaker may be used.
Trip current rating in a 40 °C (104 °F) ambient temperature is 1.25 times the minimum FLC
shown for the thermal unit selected. Instructions given above assume that the motor and the
controller are located in approximately the same ambient temperature. For other conditions,
consult Schneider Electric.
Motor
FLC (A)
Thermal
Unit No.
Maximum
Fuse Rating (A)
Motor
FLC (A)
Thermal
Unit No.
Maximum
Fuse Rating (A)
0.28-0.30
0.31-0.34
0.35-0.37
0.38-0.44
0.45-0.53
0.54-0.59
0.60-0.64
0.65-0.72
0.73-0.80
0.81-0.90
0.91-1.03
1.04-1.14
1.15-1.27
1.28-1.43
1.44-1.62
1.63-1.77
1.78-1.97
1.98-2.32
2.33-2.51
2.52-2.99
3.00-3.42
3.43-3.75
3.76-3.98
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
0.6
0.6
0.6
0.8
1
1.125
1.25
1.4
1.6
1.8
2
2.25
2.5
2.8
3.2
3.5
4
4
5
5.6
6.25
7
8
3.99-4.48
4.49-4.93
4.94-5.21
5.22-5.84
5.85-6.67
6.68-7.54
7.55-8.14
8.15-8.72
8.73-9.66
9.67-10.5
10.6-11.3
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
8
10
10
10
12
15
15
17.5
17.5
20
20
600 V Max. 250 V Max.
11.4-12.0 B 22 20 25
Following Selections for Size 1 Only
11.4-12.7
12.8-14.1
14.2-15.9
16.0-17.5
17.6-19.7
19.8-21.9
22.0-24.4
24.5-26.0
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
25
25
30
30
30
30
30
30
25
25
30
35
35
40
40
40
NEMA Size 0 & 1 Starters
Class 8536, Type S
with Melting Alloy
Overload Relay
Suitable for use on a circuit
capable of delivering not more
than 5000 rms symmetrical
amperes, 600 V maximum.
Additional information in instruction bulletins
30072-013-09 (Size 0) and 30072-013-10
(Size 1).
WARNING
ADVERTENCIA
AVERTISSEMENT
LOSS OF OVERLOAD
PROTECTION
Replace overload thermal unit if
burnout occurs to protect against
fire and shock.
Failure to follow this instruction
can result in death, serious
injury, or equipment damage.
PERTE DE PROTECTION CONTRE LES
SURCHARGES
Si une unité thermique du relais de surcharge brûle,
remplacez-la pour assurer une protection contre
l’incendie et l’électrocution.
Si cette précaution n’est pas respectée, cela peut
entraîner la mort, des blessures graves ou des
dommages matériels.
PÉRDIDA DE PROTECCIÓN CONTRA
SOBRECARGAS
Si se quema un elemento térmico del relevador de
sobrecarga, sustitúyalo para proporcionar una
protección contra incendio y descarga eléctrica.
El incumplimiento de esta precaución puede
causar la muerte, lesiones serias o daño al
equipo.
CONTROL WIRING
Control circuit conductors must be protected
against overcurrent in accordance with
applicable electrical codes. Fuseholder Kits
Class 9999 Types SF-4 and SFR-4 are available
to allow compliance.
3-WIRE CONTROL (MOMENTARY CONTACT)
PUSH BUTTON STATION
2-WIRE CONTROL (MAINTAINED CONTACT)
SELECTOR SWITCH STATION
Lead removed from Terminal 3 to coil on
controller
Maintained contact device not part of controller
START
STOP
3
2
X2
TO SEPARATE
CONTROL
HAND
OFF
AUTO
2A
Float switch,
pressure switch
or other
maintained
contact device
3A
1A
TO SEPARATE CONTROL
X2
TO LH
COIL TERM
*
*
3
X2
TO SEPARATE CONTROL