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• According to IEC/EN 60 255, DIN VDE 0435-303
• IP 9271, SP 9271, SP 9271CT: 3-phase
IK 9271, IL 9271, SK 9271, SL 9271, SL 9271CT: single phase
• Measuring ranges from 0.1 ... 100 A
• IK 9271, SK 9271:
with 4 ranges settable by rotational switch, 1 changeover contact
• IL 9271, SL 9271:
with 5 ranges settable by rotational switch, 1 changeover contact
with 4 ranges programmable by bridges, 2 changeover contacts
• IP 9271, SP 9271: with 1 range, 2 changeover contacts
• Settable response value
• Fixed hysteresis
• Settable time delay
• De-energized on trip
• Optionally energized on trip
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• Devices available in 2 enclosure versions:
- I-model, e.g. IK _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
- S-model, e.g. SK _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• Width IK 9271, SK 9271: 17.5 mm
IL 9271, SL 9271, SL 9271CT: 35 mm
IP 9271, SP 9271, SP 9271CT: 70 mm

• According to IEC/EN 60 25-1
• IP 9277, SP 9277, SP 9277CT: 3-phase
IL 9277, SL 9277, SL 9277CT: singele phase
• Detects over- and undercurrent
• Measuring ranges from 0.1 ... 15 A
• With built in current transformer for 0.5 ... 100 A
• IL 9277, SL 9277 with 4 programmable ranges
• Settable 0.1 ... 1 IN
• Separate setting for over- and undercurrent
• Fixed hysteresis approx. 4 %
• Settable time delay
• IP 9277, SP 9277 with separate settable time delay for
over- and undercurrent
• De-energized on trip
• LED indicators for over-, under- and normal current
• Auxiliary supply and measuring input galvanic separated
• IL 9277, SL 9277 with one output relay for over- and
undercurrent
• IP 9277, SP 9277 with separate output relays for over- and
undercurrent
• Optionally energized on trip
• Devices available in 2 enclosure versions:
-- I-model, e.g. IL _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
-- S-model, e.g. SL _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• DIN rail or screw mounting
• Width IL 9277, SL 9277, SL 9277CT: 35 mm
IP 9277, SP 9277, SP 9277CT: 70 mm

• According to IEC/EN 60 25-1
• IP 9277, SP 9277, SP 9277CT: 3-phase
IL 9277, SL 9277, SL 9277CT: singele phase
• Detects over- and undercurrent
• Measuring ranges from 0.1 ... 15 A
• With built in current transformer for 0.5 ... 100 A
• IL 9277, SL 9277 with 4 programmable ranges
• Settable 0.1 ... 1 IN
• Separate setting for over- and undercurrent
• Fixed hysteresis approx. 4 %
• Settable time delay
• IP 9277, SP 9277 with separate settable time delay for
over- and undercurrent
• De-energized on trip
• LED indicators for over-, under- and normal current
• Auxiliary supply and measuring input galvanic separated
• IL 9277, SL 9277 with one output relay for over- and
undercurrent
• IP 9277, SP 9277 with separate output relays for over- and
undercurrent
• Optionally energized on trip
• Devices available in 2 enclosure versions:
-- I-model, e.g. IL _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
-- S-model, e.g. SL _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• DIN rail or screw mounting
• Width IL 9277, SL 9277, SL 9277CT: 35 mm
IP 9277, SP 9277, SP 9277CT: 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Overfrequency or underfrequency monitoring of AC voltages
• Adjustable response value fmin. or fmax 5 ... 200 Hz or 15 ... 600 Hz
• Adjustable hysteresis
• Large voltage range of the measuring input (nominal voltage
AC 24 ... 440 V)
• De-energized on trip
• LED indication for auxiliary voltage, measuring voltage and contact
position
• 1 changeover contact
• As option for frequency inverters with a range of 1 … 300 Hz
• 2 changeover contacts available on request
• As option adjustable start-up delay available
• Energized on trip function available on request
• Devices available in 2 enclosure versions:
IL 9837: depth 58 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SL 9837: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• 35 mm width

• According to IEC/EN 61 812-1
• 8 functions settable via rotational switch:
- Delay on energisation (AV)
- Fleeting on make (EW)
- Delay pulse (IE)
- Flasher, start with pulse (BI)
- Delay on de-energisation (RV)
- Pulse forming function (IF)
- Fleeting on break (AW)
- Delay on energisation and de-energisation (AV / RV)
• 8 time ranges from 0.05 s ... 300 h selectable via rotational switches
• Voltage range AC/DC 24 ... 230 V
• With time interruption / time adding input
• Adjustment aid for quick setting of long time values
• Contacts:
- 1 NC + 2 NO delayed
- 1 NC + 2 NO delayed or instantaneous
• LED indicators for operation, contact position and time delay
• 52.5 mm width

• According to IEC/EN 60 255, IEC/EN 61 810-1
• Forcibly guided contacts according to IEC 61810-3
• Max. 6 output contacts
• High thermal current Ith = 8 A
• LED for operating state
• Devices available in 2 enclosure versions:
IP 3078: depth 61 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SP 3078: depth 100 mm, with terminals at the top
• Width 70 mm

• According to IEC/EN 61 557-8
• For single and 3-phase AC-systems up to 0 ... 500 V and 10 ... 10000 Hz
• Adjustable tripping value RAL of 5 ... 100 kΩ
• Monitors also disconnected voltage systems
• De-energized on trip
• Auxiliary voltage Measuring Circuit and output contacts are galvanically separated
• Manual and auto reset
• With test and reset button
• Connections of external test and reset buttons possible
• LED indicators for operation and alarm
• 2 changeover contacts
• IL/SL 5880/200 with additional prewarning
- adjustable prewarning value 10 kΩ ... 5 MΩ
- output function programmable
• Variant IL/SL 5880/300 according to DIN VDE 0100-551 for mobile generator sets available
• 4 models available:
IL 5880, IP 5880: 61 mm deep with terminals near to the bottom to be mounted in consumer units
or industrial distribution systems according to DIN 43 880
SL 5880, SP 5880: 98 mm deep with terminals near to the top to be mounted in cabinets with
mounting plate and cable ducts
• DIN rail or screw mounting
• 35 mm width

• According to IEC/EN 60 255, DIN VDE 0435-303
• Recognizes fuse failures in three-phase mains up to 3 AC 690 V
• Can be used for all types and sizes of fuses
• Independent of phase sequence
• Signals even if loads are switched off
• No malfunction on
- asymmetrical mains
- mains with harmonic waves
- motors producing feedback
• Shorter response time than with motor circuit-breakers
• Green LED for intact fuses
• Red LED for fuse failure
• As option: open/closed circuit operation in the case
of IP 9075 programmable via X4-X5 or X3-X4
• As option: with manual reset function and remote reset,
programmable via X1-X2
• As option: 1 NO contact or 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IL 9075, SL 9075: width 35 mm
IP 9075, SP 9075: width 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Identification of overvoltage, undervoltage and phase failure
• With asymmetry identification as an option
• Mains fault diagnostics with a number of LEDs
• Setting values for overvoltage and undervoltage can be set
separately
• Large Setting Ranges 0.9 ... 1.3 UN and 0.7 ... 1.1 UN
• Time delay variable between 0.1 ... 20 s
• Closed circuit operation
• No auxiliary voltage
• Independant of phase sequence
• As option with phase sequence detection
• Single-phase connection possible
• Optionally for 3P3W Systems
• 2 changeover contacts, at IP/SP 9077 2 x 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IP 9077, SP 9077: width 70 mm

• According to IEC/EN 60 255-1
• IP 9270, SP 9270CT: 3-phase
IK 9270, SK 9270, IL 9270, SL 9270CT: single phase
• Measuring ranges from 0.1 ... 100 A
• Settable response value
• Fixed hysteresis
• Settable time delay
• de-energized on trip
• energized on trip
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• Devices available in 2 enclosure versions:
- I-model, e.g. IK _ _ _ _, depth 61 mm
with terminals at the bottom for installation systems and
industrial distribution systems according to DIN 43 880
- S-model, e.g. SK _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• Width IK 9270, SK 9270: 17.5 mm
IL 9270, SL 9270CT: 35 mm

• According to IEC/EN 60 255-1
• IP 9270, SP 9270CT: 3-phase
IK 9270, SK 9270, IL 9270, SL 9270CT: single phase
• Measuring ranges from 0.1 ... 100 A
• Settable response value
• Fixed hysteresis
• Settable time delay
• de-energized on trip
• energized on trip
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• Devices available in 2 enclosure versions:
- I-model, e.g. IK _ _ _ _, depth 61 mm
with terminals at the bottom for installation systems and
industrial distribution systems according to DIN 43 880
- S-model, e.g. SK _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• Width IK 9270, SK 9270: 17.5 mm
IL 9270, SL 9270CT: 35 mm
IP 9270, SP 9270CT: 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• IP 9271, SP 9271, SP 9271CT: 3-phase
IK 9271, IL 9271, SK 9271, SL 9271, SL 9271CT: single phase
• Measuring ranges from 0.1 ... 100 A
• IK 9271, SK 9271:
with 4 ranges settable by rotational switch, 1 changeover contact
• IL 9271, SL 9271:
with 5 ranges settable by rotational switch, 1 changeover contact
with 4 ranges programmable by bridges, 2 changeover contacts
• IP 9271, SP 9271: with 1 range, 2 changeover contacts
• Settable response value
• Fixed hysteresis
• Settable time delay
• De-energized on trip
• Optionally energized on trip
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• Devices available in 2 enclosure versions:
- I-model, e.g. IK _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
- S-model, e.g. SK _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• Width IK 9271, SK 9271: 17.5 mm
IL 9271, SL 9271, SL 9271CT: 35 mm
IP 9271, SP 9271, SP 9271CT: 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• IP 9271, SP 9271, SP 9271CT: 3-phase
IK 9271, IL 9271, SK 9271, SL 9271, SL 9271CT: single phase
• Measuring ranges from 0.1 ... 100 A
• IK 9271, SK 9271:
with 4 ranges settable by rotational switch, 1 changeover contact
• IL 9271, SL 9271:
with 5 ranges settable by rotational switch, 1 changeover contact
with 4 ranges programmable by bridges, 2 changeover contacts
• IP 9271, SP 9271: with 1 range, 2 changeover contacts
• Settable response value
• Fixed hysteresis
• Settable time delay
• De-energized on trip
• Optionally energized on trip
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• Devices available in 2 enclosure versions:
- I-model, e.g. IK _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
- S-model, e.g. SK _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• Width IK 9271, SK 9271: 17.5 mm
IL 9271, SL 9271, SL 9271CT: 35 mm
IP 9271, SP 9271, SP 9271CT: 70 mm

• According to IEC/EN 60 25-1
• IP 9277, SP 9277, SP 9277CT: 3-phase
IL 9277, SL 9277, SL 9277CT: singele phase
• Detects over- and undercurrent
• Measuring ranges from 0.1 ... 15 A
• With built in current transformer for 0.5 ... 100 A
• IL 9277, SL 9277 with 4 programmable ranges
• Settable 0.1 ... 1 IN
• Separate setting for over- and undercurrent
• Fixed hysteresis approx. 4 %
• Settable time delay
• IP 9277, SP 9277 with separate settable time delay for
over- and undercurrent
• De-energized on trip
• LED indicators for over-, under- and normal current
• Auxiliary supply and measuring input galvanic separated
• IL 9277, SL 9277 with one output relay for over- and
undercurrent
• IP 9277, SP 9277 with separate output relays for over- and
undercurrent
• Optionally energized on trip
• Devices available in 2 enclosure versions:
-- I-model, e.g. IL _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
-- S-model, e.g. SL _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• DIN rail or screw mounting
• Width IL 9277, SL 9277, SL 9277CT: 35 mm
IP 9277, SP 9277, SP 9277CT: 70 mm

• According to IEC/EN 60 25-1
• IP 9277, SP 9277, SP 9277CT: 3-phase
IL 9277, SL 9277, SL 9277CT: singele phase
• Detects over- and undercurrent
• Measuring ranges from 0.1 ... 15 A
• With built in current transformer for 0.5 ... 100 A
• IL 9277, SL 9277 with 4 programmable ranges
• Settable 0.1 ... 1 IN
• Separate setting for over- and undercurrent
• Fixed hysteresis approx. 4 %
• Settable time delay
• IP 9277, SP 9277 with separate settable time delay for
over- and undercurrent
• De-energized on trip
• LED indicators for over-, under- and normal current
• Auxiliary supply and measuring input galvanic separated
• IL 9277, SL 9277 with one output relay for over- and
undercurrent
• IP 9277, SP 9277 with separate output relays for over- and
undercurrent
• Optionally energized on trip
• Devices available in 2 enclosure versions:
-- I-model, e.g. IL _ _ _ _, depth 61 mm
with terminals at the bottom for installations systems
and industrial distribution systems according to DIN 43 880
-- S-model, e.g. SL _ _ _ _, depth 100 mm
with terminals at the top for cabinets with mounting plate
and cable duct
• DIN rail or screw mounting
• Width IL 9277, SL 9277, SL 9277CT: 35 mm
IP 9277, SP 9277, SP 9277CT: 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• IP 9278, SP 9278: 3-phase
• Measuring range IP 9278, SP 9278: up to 15 A
SP 9278CT: up to 100 A
• 2 changeover contacts
• Adjustable asymmetry
• Settable time delay
• Open circuit operation
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• As option with external remote reset
• Width 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• IP 9278, SP 9278: 3-phase
• Measuring range IP 9278, SP 9278: up to 15 A
SP 9278CT: up to 100 A
• 2 changeover contacts
• Adjustable asymmetry
• Settable time delay
• Open circuit operation
• LED indicators
• With auxiliary voltage
• Auxiliary supply and measuring input galvanic separated
• As option with external remote reset
• Width 70 mm

• Command functions via illuminated buttons
• Emergency stop via emergency stop button
• Connection technology with double-spring clamp terminals for wires
up to 1.5 mm2
• Enclosure made from stainless steel
• Can be individually mounted
• Can be cascaded
• M20 cable entries underneath and two M25 cable entries on side
• M20 cable entries on top when installed as a standalone option
module
• Optional conection set for plug-in connectors between switch module /
locking switch module and option module
• Plug-in connection between command device in the cover and option
module ST2451

• Command functions via illuminated buttons
• Emergency stop via emergency stop button
• Connection technology with double-spring clamp terminals for wires
up to 1.5 mm2
• Enclosure made from stainless steel
• Can be individually mounted
• Can be cascaded
• M20 cable entries underneath and two M25 cable entries on side
• M20 cable entries on top when installed as a standalone option
module
• Optional conection set for plug-in connectors between switch module /
locking switch module and option module
• Plug-in connection between command device in the cover and option
module ST2451