Brochure

7
5/98
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Melting Alloy
NEMA-rated Thermal Overload Relays feature:
• Exclusive One-Piece Thermal Unit • Trip Free Reset Mechanism on Types F, G & S
• Inverse Time Delay Trip • Replaceable Contact Units on Types F, G & S
• Alarm Contact Available
Slow trip (Class 30) and quick trip (Class 10) melting alloy thermal units are available for all Size 1, 2, 5
and 6, and some Size 3 and 4 applications. Thermal units are not included.
For Separate Mounting – Melting Alloy – 600 Volts Maximum, AC or DC
a
Size
Maximum Full
Load Current
(Amperes)
Open Type
for Separate Panel Mounting
For Terminal Block Channel Mounting Order
Open Type Relay and Bracket Kit Below
Left Hand Type Right Hand Type Type
Single Pole Construction (One N.C. Contact) — 1 Thermal Unit Required
1
2
3
4
5
25
45
86
133
266
CO1
TO1
UO1
FO1L
GO11L
CO1R
TO1
UO1
FO1R
GO11R
...
...
...
...
...
Three Pole Construction (One Common N.C. Contact on Type S Only) — 3 Thermal Units Required
1
2
3
4
25
45
86
133
SEO5
SEO8
SEO12
SEO15
SM2
SM2
...
...
5 266 Use 3 Type GO11R Relays Listed Above ...
a Maximum power circuit rating for separate mounting overload relays, Types C, F, G, T and U, is 600 volts AC or DC; Type S is 600 volts AC only.
Maximum control circuit contact rating for Types C, F, G, T, U and SDO18 is 600 volts AC and 250 volts DC; the remaining Type S versions are 600
volts AC only.
Replacement Melting Alloy Overload Relays for Square D Class 8536 Starters
Locate Class 8536 Starter in this Column Order Class 9065 Overload Relay from this Column
NEMA Size Type Series
Number of
Poles
Type
Number of Thermal
Units Required
00 SA A & B
2
3
SDO4
SDO5
1
3
0SBA
2
3-5
SDO4
SDO5
1
3 q
1SCA
2
3-5
SDO4
SDO5
1
3 q
1P SC A 2 SDO10 1
2SDA
2
3-5
SDO7
SDO8
1
3 q
3SEA
2
3
4
5
SDO11
SDO12
SDO13
SDO14
1
3
2
3
4SFA
3
4
5
SDO15
SDO16
SDO17
3
2
3
5 SG A 3‡ SDO18 1
6 SH A & B 3 SEO5 3
q For 4-pole starters used on two phase systems order 2 thermal units plus one Class 9998 Type SO31 jumper strap kit for every two starters. Each kit
includes two jumper straps.
u Type S Size 5 starters use three Type SDO18 overload relays per starter.
Special Features for Melting Alloy Types
Form
Substitute 1-N.O. isolated alarm contact and 1-N.C. contact per relay. (Type S starters only) p Y342 p
Substitute 2-N.C. contacts for standard N.C. contact per relay. (Type S starters only) Y344 p
Modify Type U relay to accept Type FB quick trip or SB slow trip thermal units. (Accepts Type C standard trip) Y21 k
Modify Type SDO12 relays to accept Type FB quick trip or SB slow trip thermal units, and Type F, and Type SDO15 relays to accept Type
FB quick trip thermal units. (Rejects Type CC standard trip units)
Y81 k
k This form cannot be field modified.
p Field modification possible. Order 9999 S04 (for Form Y342 ) or 9999 S05 (for Form Y344 ).
Type SEO5
Type CO1R