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Industrial Automation
S8BA
Uninterruptible Power Supply (UPS)
DC-DC type small UPS mounts on a DIN rail to provide an ideal countermeasure for momentary power losses and power failures in industrial computers (IPC) and controllers.
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last update: September 1, 2025
S8BA-LF Integrated battery type
Ratings, Characteristics, and Functions
| Capacity | 120 W | 240 W | 360 W | 480 W *4 | ||
|---|---|---|---|---|---|---|
| DC input | Rated input voltage | 24 VDC | ||||
| Input
voltage range |
When standard
voltage sensitivity is set |
24 VDC±10% | ||||
| When low voltage
sensitivity is set |
24 VDC±12.5% | |||||
| When high voltage
sensitivity is set |
24 VDC±5% | |||||
| Input
maximum current |
for rated input
voltage for rated loads connected |
5.9 A | 11.7 A | 17.5 A | 23.3 A *5 | |
| Input terminal | Push-in terminal block | |||||
| Input protection | Fuse (cannot be replaced by the customer) | |||||
| Input protection capacity | 10 A | 15 A | 30 A | |||
| DC output | Rated
current |
(for rated output
voltage) |
5 A | 10 A | 15 A | 20 A *6 |
| Switching time | Uninterrupted | |||||
| Output
voltage |
Normal operation | Output of input voltage as-is | ||||
| Backup operation | 24 V±5% | |||||
| Output terminal | Push-in terminal block | |||||
| Overload protection | Alarm display at a load level of 110% or over (normal operation) | |||||
| Alarm display at a load level of 110% or over and output voltage drop
(backup operation) |
||||||
| Alarm display cancellation at a load equal to or below the rated
capacity (normal operation, backup operation) |
||||||
| Battery | Type | Lithium-ion battery | ||||
| Rated voltage | 14.4 VDC | |||||
| Rated capacity | 1600 mAh ×
1 parallel |
1600 mAh ×
2 parallel |
1600 mAh ×
3 parallel |
1600 mAh ×
4 parallel |
||
| Expected battery life *1 | 2.5 years (50°C), 5 years (40°C), 10 years (25°C) | |||||
| Replacement by user | Yes (Hot swapping) | |||||
| Auto battery check function | Yes | |||||
| Battery life counter function | Yes | |||||
| Charging time | 4 hours *7 | |||||
| Backup time (25°C, initial characteristics) | 6 min. (120 W) | 6 min. (240 W) | 6 min. (360 W) | 6 min. (480 W) | ||
| Environment | Operating ambient
temperature/humidity |
0 to +55°C/10 to 90% (with no condensation) | ||||
| Storage ambient
temperature/humidity |
-20°to +55°C/10 to 90% (with no condensation) | |||||
| Vibration resistance | JIS C 60068-2-6 compliant. 5 to 8.4 Hz amplitude: 3.5 mm, 8.4 to 150
Hz acceleration rate: 9.8 m/s2 X, Y, and Z directions for 100 minutes (Time coefficient: 10 minutes × coefficient factor 10 = total time 100 min.) |
|||||
| Shock resistance | JIS C 60068-2-27 compliant. 147 m/s2, 3 times in X, Y, and Z
directions. |
|||||
| Structure | Dimensions (W × D × H mm) | 94 × 100 ×
100 |
148 × 100 ×
100 |
270 × 100 × 100 | ||
| Weight of unit | Approx. 0.8 kg | Approx. 1.3 kg | Approx. 2.0 kg | Approx. 2.3 kg | ||
| Cooling method | Natural cooling | |||||
| Insulation
and withstand voltage |
Withstand voltage | 1,000 V 50/60 Hz AC between the DC external terminals and the GR
terminal for 1 minute at a leakage current of 10 mA max. |
||||
| Insulation resistance | 20 MΩ min. between the DC external terminals and the GR terminal
(at 500 VDC) |
|||||
| Compliance
to standard |
Safety standard | UL508/CE/UKCA/C22.2 No.107.1-01 | ||||
| EMI | Radiated
disturbance electromagnetic field strength |
EN61000-6-4/FCC/ICES/RCM/KC | ||||
| Ship standard | LR/DNV/EN60945 *8 | |||||
| Internal power consumption (normal *2/
maximum *3) |
7 W/22 W | 11 W/41 W | 14 W/60 W | 18 W/80 W | ||
| Serial com-
munication |
RS-232C (Interface terminal) | Yes (RJ45) | ||||
| USB (interface terminal) | Yes (B connector) | |||||
| I/O signal (Interface terminal) | Yes (RJ45) | |||||
| Accessories | USB cable (1.5 m) | |||||
| Accessory functions | Beeper setting; Auto restart setting; Auto test setting; Auto restart
mode setting; Input sensitivity setting; Remote ON/OFF signal logic setting; Cold start setting; Battery life counter setting; Power switch function setting; Maximum backup time setting; Startup battery level setting; Backup stop (BS) signal delay time setting; Backup (BU) signal delay time setting; and Contact signal I/O test |
|||||
*1. An estimated value for standard mounting. Not a guaranteed value.
*2. Conditions: With rated loads connected, at a rated input voltage, and with the battery fully charged.
*3. Conditions: With rated loads connected, at a rated input voltage, and at the maximum battery charging current.
*4. 400 W for use as a UL compliant device.
*5. 20 A for use as a UL compliant device.
*6. 16.7 A for use as a UL compliant device.
*7. When using in an environment at a high temperature, charging may be paused by charging temperature protection,
then the charging time will be longer than specified time.
"CS" will be displayed when charging temperature protection is operated.
*8. For the S8BA-24D24D120LF, install all of the RSMN-2030, RSHN-2030, and RSEN-2030 EMC filters manufactured by
TDK. For the S8BA-24D24D240LF, S8BA-24D24D360LF, or S8BA-24D24D480LF, install both the RSMN-2030 and
RSHN-2030 or their equivalents. Install these filters in series to the cable connected to the DC input terminal block.
When you do, do not connect anything to the GR terminal.
The effectiveness of the noise filters may be affected by the installation environment. Be sure to check effectiveness
before starting operation.
*2. Conditions: With rated loads connected, at a rated input voltage, and with the battery fully charged.
*3. Conditions: With rated loads connected, at a rated input voltage, and at the maximum battery charging current.
*4. 400 W for use as a UL compliant device.
*5. 20 A for use as a UL compliant device.
*6. 16.7 A for use as a UL compliant device.
*7. When using in an environment at a high temperature, charging may be paused by charging temperature protection,
then the charging time will be longer than specified time.
"CS" will be displayed when charging temperature protection is operated.
*8. For the S8BA-24D24D120LF, install all of the RSMN-2030, RSHN-2030, and RSEN-2030 EMC filters manufactured by
TDK. For the S8BA-24D24D240LF, S8BA-24D24D360LF, or S8BA-24D24D480LF, install both the RSMN-2030 and
RSHN-2030 or their equivalents. Install these filters in series to the cable connected to the DC input terminal block.
When you do, do not connect anything to the GR terminal.
The effectiveness of the noise filters may be affected by the installation environment. Be sure to check effectiveness
before starting operation.
S8BA-SBF Separated battery type
Ratings, Characteristics, and Functions
| Capacity | 480 W | 960 W | ||
|---|---|---|---|---|
| DC input | Rated input voltage | 24 VDC | ||
| Input voltage range | 23 to 28 VDC | |||
| Input
maximum current |
for rated input voltage
for rated loads connected |
21.5 A | 43.5 A | |
| Input terminal | Push-in terminal block | |||
| Input protection | Fuse (cannot be replaced by the customer) | |||
| Input protection capacity | 30 A | 60 A | ||
| DC output | Rated
current |
for rated output voltage | 20 A | 40 A |
| Switching time | Uninterrupted | |||
| Output
voltage |
Normal operation | Input voltage through output | ||
| Backup operation | 21 to 28 V (the voltage cannot be adjusted) | |||
| Output terminal | Push-in terminal block | |||
| Overload
protection |
Warning display
• UPS output will continue through bypass [during normal operation] • UPS output will continue through battery [during backup operation] |
101% or more | ||
| Output stopped by
overload protection • Stop output [during normal operation] • The internal power supply to the UPS will stop after 10 sec. [during backup operation] |
111% or more | |||
| Warning display
cancellation (During normal operation, during backup operation) |
93% or more | |||
| Battery unit | Type | Lithium-ion battery | ||
| Rated voltage | 25.2 VDC | |||
| Rated capacity | 3900 mAh | 7800 mAh | ||
| Battery life expectancy *1 | 10 years (25°C), 6.7 years (35°C), 3.7 years (45°C),
1.9 years (55°C) |
|||
| Replacement by user | Yes (Hot swapping) | |||
| Battery Life Counter Function | Yes | |||
| Charging time | 8 hours (90%) *3 | |||
| Backup time (25°C, initial
characteristics) |
6 min. (constant power rated load)
The backup time can be set from the mode selection/ backup operation time selection switch, or the shutdown software. |
|||
| Environment | Operating environment temperature/
humidity |
0 to +55°C / 10 to 90%RH with no condensation | ||
| Storage environment temperature/
humidity |
-20 to +55°C / 10 to 90%RH with no condensation | |||
| Vibration resistance | JIS C 60068-2-6 compliant
5 to 8.4 Hz amplitude: 3.5 mm, 8.4 to 150 Hz acceleration rate: 9.8 m/s2 X, Y, and Z directions: 100 min. (Sweep time: 10 min.×Sweep count 10 times=Total: 100 min.) |
|||
| Shock resistance | JIS C 60068-2-27 compliant: 147 m/s2 X, Y, and Z
directions three times |
|||
| Structure | Dimensions (W×H×D mm) *2 | 44 × 124 × 111.4 (UPS
control unit 20 A) 80 × 124 × 111.4 (battery unit 20 A) |
52 × 124 × 111.4 (UPS
control unit 40 A) 150 × 124 × 111.4 (battery unit 40 A) |
|
| Weight | Weight of control unit | Approx. 0.6 kg | Approx. 0.7 kg | |
| Weight of battery unit | Approx. 1.5 kg | Approx. 2.5 kg | ||
| Cooling method | Natural cooling | |||
| Dielectric
breakdown voltage |
Withstand voltage | DC external terminals to casing: 510 V AC, 1 minute,
leakage current 5 mA max. |
||
| Insulation resistance | DC external terminals to casing: 20 MΩ or more. (500 V
DC) |
|||
| Standard
compliance |
Safety standard | UL508/CE/UKCA/C22.2 No. 107.1-01 | ||
| EMI | Radiation disturbance
field strength |
EN61000-6-4/FCC/ICES/RCM/KC | ||
| Internal power consumption
(normal *4/maximum *5) |
7 W/29 W | 15 W/58 W | ||
| Serial com-
munication |
RS-232C (Interface terminal) | Yes (RJ45) | ||
| USB (Interface terminal) | ||||
| I/O signal (Interface terminal) | Yes (RJ45) | |||
| Accessories | USB cable (2.2 m) (included with control unit)
Battery communication cable (included with battery unit) |
|||
| Accessory functions | Remote ON/OFF signal logic setting; Battery life counter
setting; Maximum backup time setting; Startup battery level setting; Backup stop (BS) signal delay time setting; and Backup (BU) signal delay time setting |
|||
*1. Guideline for a standard installation. Not a guaranteed value.
*2. Unit dimensions excluding the DIN rail stopper.
*3. When using in an environment at a high temperature, charging may be paused by charging temperature protection,
then the charging time will be longer than specified time.
*4. Conditions: With rated loads connected, at a rated input voltage, and at a full battery charge.
*5. Conditions: With rated loads connected, at a rated input voltage and at maximum battery charging current.
*2. Unit dimensions excluding the DIN rail stopper.
*3. When using in an environment at a high temperature, charging may be paused by charging temperature protection,
then the charging time will be longer than specified time.
*4. Conditions: With rated loads connected, at a rated input voltage, and at a full battery charge.
*5. Conditions: With rated loads connected, at a rated input voltage and at maximum battery charging current.
last update: September 1, 2025
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