7-17
7-3 Options
7
Specifications
Specifications
Built-in resistor type (3G3AX-RBU21/-RBU22/-RBU41)
*1 When using a braking resistor (model 3G3AX-RAB/-RBB/-RBC) for a 400-V-class regenerative braking unit,
disconnect the built-in resistor and connect two of the same size braking resistors in series.
Damage may occur to a 400-V-class regenerative braking unit if operated with only one braking resistor con-
nected.
*2 Set up using DIP switch.
*3 Built-in resistors are equipped with thermal fuses.
If the alarm is not connected, the fuse may blow to prevent burnout due to overheating.
If the fuse blows, the built-in resistor will need to be replaced.
Applicable voltage class 3-phase 200-V class 3-phase 400-V class
Model 3G3AX-RBU21 3G3AX-RBU22 3G3AX-RBU41
Connection resistance 17 Ω min. 17 Ω min. 34 Ω min.
Operating voltage
ON/OFF
ON : 362.5 ± 5 V
OFF: 355 ± 5 V
ON : 725 ± 5 V
OFF: 710 ± 5 V
Operation indication LED ON (Lit)
Parallel interlocking
operation function
5 units max.
Built-in resistor
Internal resistance 120 W, 180 Ω 120 W, 20 Ω 120 W, 180 Ω × 2 in series
Allowable
consecutive ON
time
10 s max. 0.5 s max. 10 s max.
Allowable
operation cycle
Cycle 1/10
(ON for 10 s, OFF for 90 s)
Cycle 1/80
(ON for 0.5 s, OFF for 40 s)
Cycle 1/10
(ON for 10 s, OFF for 90 s)
Power
consumption
Instantaneous 0.73 kW
Short-time rating 120 W
Instantaneous 6.6 kW
Short-time rating 120 W
Instantaneous 1.46 kW
Short-time rating 240 W
Built-in resistor
overheat protection
• Cooling fin temperature Relay operates at approximately 200°C or higher.
Recovers at approximately 170°C or lower.
• Rating of contact 250 V AC 200mA (R load)
12 V DC 500mA (R load)
42 V DC 200mA (R load)
• Minimum load 1mA (R load)
Operating environment
Ambient
temperature
-10°C to 50°C
Ambient storage
temperature
-20°C to 65°C (short-time temperature during transport)
Humidity 20% to 90% (with no condensation)
Vibration 5.9 m/s
2
(0.6G) 10 to 55 Hz
Location At a maximum altitude of 1,000 m; indoors (without corrosive gases or dust)
Paint color Munselle 5Y7/1 (cooling fan: aluminum ground color)
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