CONTROL AND INSTRUMENT SWITCHES - Types SB-1, SB-9, and SB-10

Nov 4, 2026

Technical instructions for GE General Electric Type SB-1, SB-9, and SB-10 control and instrument switches describe multi-pole rotary operation using cam-operated contacts, plus SB-10 push-pull shaft contact action with interlocks. Coverage includes application guidance for controlling circuit breakers, small motors, magnetic switches, meters, instruments, and relays. The document provides electrical ratings, including interrupting ratings (non-inductive and inductive circuits) based on trip-coil inductance and contact series arrangements, along with receiving, storage, and basic construction details.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages16

Reading Time40 min

AccessFree to download

CONTROL AND INSTRUMENT SWITCHES

TYPES SB-1, SB-9, AND SB-10

INTRODUCTION

APPLICATION

RATINGS

INTERRUPTING RATINGS - AMPERES

RECEIVING AND STORAGE

RECEIVING

STORAGE

DESCRIPTION

CONSTRUCTION

CONTACT IDENTIFICATION

ENCLOSURES AND MOUNTING

INSTRUCTIONS # CONTROL ANDINSTRUMENT SWITCHES Types SB-1,SB-9, and SB-10 GENERALELECTRIC GEH-908 Fig.1(8008678) Type SB-1 Switch Without Cover Fig.2(8008677)Type SB-9 Switch Without Cover Fig.3(8008679) Type SB-10 Switch Without Cover Cover(8008680) ## CONTROL AND INSTRUMENT SWITCHESTYPES SB-1,SB-9,AND SB-10INTRODUCTION The Type SB-1 switches(see cover illustration and Fig.1)are mu1ti-pole rotary switches with cam-operated contacts.They have their positioning devices or return springs located between the front supportand first barrier while the Type SB-9(see Fig.2)has the positioning device or return spring located atthe rear of the switch.The Type SB-9 also has better insulation to ground,more substantial bearings,andlong life cams. The Type SB-10 switches(see Fig.3)combine contacts operated by rotation of the shift,as in the SB-1and 9 switches,with contacts operated by a lateral motion(push or pu11)of the shaft.Only two lateralpositions of the shaft are possible.Interlocks are usually provided so the push-pu11l contacts can be oper-ated only in specific rotary positions of the switch,and also the rotary contacts can be operated in onlyone lateral position of the shaft,either push or pul1. NOTE:Instructions for Type SB-1 switches also apply to superseded Type SB-7 switches. ### APPLICATION The Type SB-1,SB-9 and SB-10 switches are primarily intended for the control of electrically operatedcircuit breakers,sma11 motors,magnetic switches and similar devices,and for the transfer of meters,in-struments and relays.The Type SB-1 switch is suitable for most applications,but where the switch is sub-ject to abnorma1iy frequent operation(approximately 100 operations or more per hour,more durable cams arerequired,in which case the Type SB-9 switch should be ordered. ### RATINGS A11 switches are rated 600 volts,20 amperes continuous,and 250 amperes for three seconds. The interrupting rating depends on several factors;namely,voltage,current,and inductance of thecircuit.It is often necessary to connect several contacts in series to secure sufficient interruptingcapacity.The interrupting ratings in the table below are based on the inductance of the average trip coil. ### INTERRUPTING RATINGS -AMPERES | CIRCUIT
VOLTS | NON-INDUCTIVE CIRCUIT | | | INDUCTIVE CIRCUIT | | | | --- | --- | --- | --- | --- | --- | --- | | | NUMBER OF CONTACTS | | | | | | | | 1 | 2 in Series | 4 in Series | 1 | 2 in Series | 4 in Series | | 24 DC | 6.0 | 30.0 | | 4.0 | 20.0 | 30.0 | | 48 DC | 5.0 | 25.0 | 40.0 | 3.0 | 15.0 | 25.0 | | 125 DC | 2.7 | 11.0 | 25.0 | 2.0 | 6.25 | 9.5 | | 250 DC | 0.75 | 2.0 | 8.0 | 0.7 | 1.75 | 6.5 | | 600 DC | 0.25 | 0.45 | 1.35 | 0.15 | 0.35 | 1.25 | | 115 AC | 40.0 | 75.0 | | 24.0 | 50.0 | | | 220 AC | 25.0 | 50.0 | | 12.0 | 25.0 | 40.0 | | 440 AC | 12.0 | 25.0 | | 5.0 | 12.0 | 20.0 | | 550 AC | 6.0 | 12.0 | | 4.0 | 10.0 | 15.0 | | These instructions do not purport to cover all details or variations in equipment nor to provide for
every possible contingency to be met in connection with installation,operation or maintenance. Should
further information be desired or should particular problems arise which are not covered sufficient1y for
the purchaser's purposes,the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI,IEEE and NEMA standards;
but no such assurance is given with respect to local codes and ordinances because they vary greatly. | | --- | RECEIVING AND STORAGE ### RECEIVING Immediately upon receipt of a switch,examine it for any damage sustained in transit.If injuryor rough handling is evident,file a damage claim at once with the transportation company andpromptly notify the nearest General Electric Apparatus Sales Offi

FAQs

How do Type SB-1 and Type SB-9 switches differ in contact positioning components?

Type SB-1 has positioning devices or return springs between the front support and the first barrier, while Type SB-9 locates them at the rear of the switch. Type SB-9 also provides improved insulation to ground and more substantial bearings with long-life cams.

What makes the Type SB-10 switch different from SB-1 and SB-9?

Type SB-10 combines rotation-operated contacts like SB-1 and SB-9 with additional contacts operated by lateral push-pull motion of the shaft. Interlocks limit push-pull operation to specific rotary positions and likewise restrict rotary contacts to only one lateral position.

What information is provided for interrupting ratings and how are they determined?

Interrupting ratings depend on circuit voltage, current, and inductance. The table values are based on the inductance of the average trip coil, and may require connecting multiple contacts in series to achieve adequate interrupting capacity.

Nov 4, 2026

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