Brochure
Table Of Contents
- Introduction
- Motor Failure and Protection
- Trip Class Designation
- Withstand Ratings
- Thermal Overload Relay
- Melting Alloy
- Non-Compensated Bimetallic
- Automatic Reset
- Ambient Temperature Compensated Bimetallic
- Thermal Overload Relay Trip Characteristics
- Solid State Overload Relay
- Additional Standard Features
- Optional Features
- Additional Standard Features
- Optional Features
- General
- Nameplate Versus NEC Full-load Current
- Service Factor
- Motor Branch Circuit Design
- Overload Relays
- Hand Reset Melting Alloy
- Accessories
- Isolated Auxiliary Contacts for Motor Logic Overload Relays
- DIN Adapter
- Lug-Lug/Lug-Extender Kits
- Remote Reset Module
- 4 – 20 ma DC Communication Module
- Contact Units for Melting Alloy Type Overload Relays
- Melting Alloy Overload Relay Jumper Strap Kits
- Bimetallic Overload Relays
- Motor Logic™ – Solid State Overload Relay
© 1998 Square D All Rights Reserved
10
5/98
Thermal Overload Relays – NEMA Rated
Solid State Overload Relay, Motor Logic
™
Feature Base Unit
Feature Unit relays
include all of the features found on the Base Unit relays plus: switch selectable trip
class; Class II ground fault detection; and direct replacement for Type S melting alloy. These relays will
also accept the Analog Output Module or Seriplex
®
communication module. Electrical remote reset is
also available.
Additional Standard Features
• Self-powered
• Repeat trip accuracy: +/- 2%
• Normally closed trip contact
• Visible trip indication
• Trip free operation
• Ambient insensitivity
• Harmonic immunity
• Thermal memory
• Trip test function
• Ground fault detection
• 3 Second trip on phase imbalance
≥
25% (see Page 13)
Optional Features
• Auxiliary contacts
• Electrical remote reset
• Lug-Lug kits for separate mounting
• DIN rail adapter bracket
• Lug-Extender kit for retrofit (00
B
, 00
C
, 0, 1)
• 4-20 mADC, analog output module
• Seriplex
®
communication module
Feature Unit: For Separate Mounting Solid State Overload Relay
600 Volts AC Maximum
Size
(3 Pole)
Full Load Current Range
(Amperes)
Open Type
Trip Class 10/20
00
B
c
00
C
c
0
c
1
c
2
3
4
5
f
1.5 – 4.5
3 – 9
6 – 18
9 – 27
15 – 45
30 – 90
45 – 135
90 – 270
SFB20
SFC20
SF020
SF120
SF220
SF320
SF420
SF520
c
Size 00
B
, 00
C
, 0, and 1 are supplied without lugs. Lower amperage loads can be protected by looping of power wires.
f
Size 5 is a complete drop-in replacement for Square D NEMA Type “S” melting alloy, bimetallic, and Y500 overload relays
only
.
Feature Unit: Replacement SSOLR for Retrofit of Square D Type S Starter
Solid State Overload Relay – 600 Volts AC Maximum
Locate 8536 Starter
in this column
NEMA Size
Full Load Current Range
(Amperes)
Order Class 9065 Overload from this column
Open Type
Trip Class 10/20
SA
SA
SB
SC
SD
SE
SF
SG
SH
SJ
00
B
p
00
C
p
0
p
1
p
2
3
4
5
a
6
a
7
a
1.5 – 4.5
3 – 9
6 – 18
9 – 27
15 – 45
30 – 90
45 – 135
90 – 270
180 – 540
270 – 810
SFB20
SFC20
SF020
SF120
ST220
ST320
ST420
ST520
ST620
ST720
p
Size 00
B
, 00
C
, 0, and 1 are supplied without lugs. Lower amperage loads can be protected by looping of power wires.
a
Size 5, 6 and 7 Replacement Overloads are only for existing NEMA Type “S” starters with Motor Logic™. External CTs and additional components
are not included.