ABB S260, S270, S280, S290 General Product Line Information

Pro M Miniature Circuit Breakers

S260, S270, S280, S290

System

Pro M

14

Description

The S2 Series of miniature circuit breakers
offer a compact solution to protection
requirements. The breakers are recognized
under standard UL 1077 as supplemental
protective devices. The S2 devices are
current limiting, DIN rail mounted and can
offer a good equivalent to fused systems.

The S2 is available with application-specifi c
trip characteristics to provide maximum
circuit protection. The breakers offer
thermal-magnetic trip protection according to
B, C, D, K and Z characteristics.

For the worldwide market, the breakers carry
UL, CSA, IEC, CE and many other agency
approvals and certifi cations.

Features

• Current limiting

• Fast breaking time (2.5 – 3.5 msec)

• Unique bus connection system

• Wide range of accessories

• Available with variable depth handle
mechanism

• Optional Z curve for SCR protection

• CE certifi ed and marked

• DIN rail or front panel mounting

• Finger safe terminals

• Multi-function terminals

• Suitable for reverse feed

• UL 1077 and CSA 22.2

• 277/480VAC and 500VDC versions

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Low Voltage Products & Systems 14.1

ABB Inc. • 888-385-1221 • www.abb-control.com AC 1000 - 11/03

System

Pro M

14

General information

S260, S270, S280, S290

General information

Miniature circuit breakers (MCBs) are used throughout the world in all
types of electrical in stal la tions. ABB MCBs are recognized for use by
Un der writ ers Lab o ra to ries Stan dard UL1077 for sup ple men ta ry circuit
pro tec tors in systems rated 240VAC, 480VAC and 600VAC. Devices are
certifi ed per CSA C22.2.

MCBs are approved per IEC-898 and VDE 0641, and certifi ed under
IEC-947 and VDE 0660 standards for use in sys tems rated 415VAC or
690VAC (S500 series).

MCBs can be applied to 16 2/3Hz – 400Hz and DC power systems.
Special direct current version MCBs include a per ma nent magnet for DC

fault current in ter rup tion. These "UC" versions are rated 250/500VDC
under UL1077/CSA 22.2 No. 235.

Continuous current ratings are as low as 0.2 amperes and up to 125
amperes maximum.

MCBs are of compact size and can be quickly mounted on standard
35mm DIN rail or can be front mounted by use of a front mounting kit.

MCBs include line and load side terminals for conductors from 18
through 4AWG (0.75 – 25mm2) for 40 amperes; up to 2AWG for 50 and
63 amperes.

MCBs can also be connected via busbar conductors which can be
either upper or lower mounted for top feed or bottom feed. Dual function
terminals allow busbars to be connected with main incoming line
conductors without separate lugs.

Accessories

Auxiliary devices can be added to S260, S270 and S280 series MCBs:

• Shunt trips

• Auxiliary contacts

• Trip contacts

• Aux/trip contacts

• Undervoltage release
Accessory device modules can be fi eld mounted to all above listed ABB

MCBs. Auxiliary contacts are also available for the S500 series MCB.

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Applications

MCBs can be used for equipment protection, in com mer cial ap pli anc es,
protection of control circuits against overcurrent faults, computer
equipment and other com put er peripheral devices.

UL 1077

MCBs are recognized as supplementary protectors and are intended
for use as overcurrent protection within an appliance or other electrical
equipment where branch circuit overcurrent protection is already
provided or not required. MCBs and accessories are recognized under
UL File E76126.

CSA C22.2

MCBs and accessories are certifi ed under CSA C22.2 No. 235 per File
LR98793.

Tripping characteristics

Time-current curves

ABB miniature circuit breakers are available with different trip
char ac ter is tics, allowing for maximum system protection.

B Char ac ter is tic

Available with the S260 series has rat ed currents of 6 through 63
amperes in 10 steps. The "B" time-current curve is de signed primarily
for use in cable protection applications. Instantaneous tripping occurs
between ap prox i mate ly 3 to 5 times rated current in 50/60Hz sys tems.
This quick trip curve maximizes pro tec tion of control circuits under low
short circuit fault levels that could damage control wiring.

C Characteristic

Available in the S260 series with rated currents up though 63 amperes
and the S290 series with rated currents of 80, 100 and 125 amperes.
The "C" time-current curve is de signed for medium magnetic start-up
currents. Instantaneous tripping occurs between 5 and 10 times rated
current in 50/60 Hz systems. The "C" characteristic is also available in
other S2 Series MCBs.

D Characteristic

The new magnetic trip action has an instantaneous trip between 10 and
20 times the breaker rating. Thus, the S260-D can be a good protective
solution for applications involving high in-rush transformers, motors
and other high inductive systems. The 260-D is also suitable for any
application where a high instantaneous trip point is desired.

K Characteristic

The "K" time-current char ac ter is tic considers high magnetic start-up
currents from motors, trans form ers and other equipment. Instantaneous
trip ping occurs between 8 and 12 times rat ed current in 50/60Hz
systems. The "K" char ac ter is tic is available up through 63 amperes.

The "K" curve offers the best pro tec tion for the broad est range of
electrical systems. The higher magnetic trip settings max i miz es
protection while allowing for higher in-rush currents during system start­up.

Z Characteristic

Also available up through 63 amperes, the "Z" char ac ter is tic offers
instantaneous tripping between 2 and 3 times rated current in 50/60Hz
systems. This trip characteristic is available in the S280 series with both
the 480VAC and 250/500VDC ratings.

Many applications require a very low short circuit trip settings in order
to protect semiconductor or other sensitive devices and the "Z" trip
characteristic may provide maximum pro tec tion and service in these
applications.

14.2 Low Voltage Products & Systems

AC 1000 - 11/03 ABB Inc. • 888-385-1221 • www.abb-control.com