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General data
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Sizes
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S00 ... S3
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S00 ... S3
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S6 ... S12
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- Are coordinated with the dimensions, connections and technical characteristics of the other devices in the SIRIUS modular system (contactors, etc.)
- Permit the mounting of slim-line and compact load feeders in widths of 45 mm (S00, S0), 55 mm (S2), 70 mm (S3), 120 mm (S6) and 145 mm (S10/S12)
- Simplify configuration
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Seamless current range
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0.11 ... 100 A
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0.1 ... 115 A
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50 ... 630 A
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- Allows easy and consistent configuration with one series of overload relays (for small to large loads)
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Protection functions
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Tripping due to overload
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✓
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✓
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✓
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- Provides optimum inverse-time delayed protection of loads against excessive temperature rises due to overload
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Tripping due to phase asymmetry
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✓
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✓
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✓
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- Provides optimum inverse-time delayed protection of loads against excessive temperature rises due to phase asymmetry
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Tripping due to phase failure
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✓
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✓
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✓
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- Minimizes heating of three-phase motors during phase failure
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Protection of 1-phase loads
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✓
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--
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--
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- Enables the protection of 1-phase loads
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Tripping in the event of overheating
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--1)
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--1)
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--1)
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- Provides optimum temperature-dependent protection of loads against excessive temperature rises, e.g. for stator-critical motors or in the event of insufficient coolant flow, contamination of the motor surface or long starting or braking operations
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Tripping in the event of a ground fault
by
internal ground fault detection (activatable)
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--
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✓
(only 3RB31)
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✓
(only 3RB21)
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- Provides optimum protection of loads against high-resistance ground faults due to moisture, condensed water, damage to the insulation material, etc.
- Eliminates the need for additional special equipment
- Saves space in the control cabinet
- Reduces wiring overhead and costs
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Equipment
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RESET function
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✓
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✓
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✓
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- Allows manual or automatic resetting of the device
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Remote RESET function
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✓
(by means of separate module)
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✓
(only with 3RB31
and external
auxiliary voltage
24 V DC)
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✓
(only with 3RB21
and external
auxiliary voltage
24 V DC)
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- Allows the remote resetting of the device
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TEST function for auxiliary contacts
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✓
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✓
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✓
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- Allows easy checking of the function and wiring
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TEST function for electronics
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--
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✓
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✓
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- Allows checking of the electronics
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Status display
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✓
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✓
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✓
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- Displays the current operating state
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Large current adjustment button
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✓
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✓
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✓
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- Makes it easier to set the relay exactly to the correct current value
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Integrated auxiliary contacts
(1 NO + 1 NC)
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✓
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✓
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✓
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- Allow the load to be switched off if necessary
- Can be used to output signals
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Design of load feeders
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Short-circuit strength up to 100 kA at 690 V
(in conjunction with the corresponding fuses or the corresponding motor starter protector)
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✓
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✓
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✓
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- Provides optimum protection of the loads and operating personnel in the event of short circuits due to insulation faults or faulty switching operations
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Electrical and mechanical matching to 3RT contactors
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✓
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✓
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✓
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- Simplifies configuration
- Reduces wiring overhead and costs
- Enables stand-alone installation as well as space-saving direct mounting
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Straight-through transformers for main circuit
2)
(in this case the cables are routed through the feed-through openings of the overload relay and connected directly to the box terminals of the contactor)
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--
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✓
(S2, S3)
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✓
(S6)
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- Reduce the contact resistance (only one point of contact)
- Save wiring costs (easy, no need for tools, and fast)
- Save material costs
- Reduce installation costs
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Spring-loaded terminals for main circuit
2)
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✓
(S00, S0)
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✓
(S00, S0)
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--
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- Enable fast connections
- Permit vibration-resistant connections
- Enable maintenance-free connections
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Spring-loaded terminals for auxiliary circuits
2)
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✓
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✓
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✓
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- Enable fast connections
- Permit vibration-resistant connections
- Enable maintenance-free connections
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Other features
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Temperature compensation
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✓
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✓
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✓
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- Allows the use of the relays at high temperatures without derating
- Prevents premature tripping
- Allows compact installation of the control cabinet without distance between the devices/load feeders
- Simplifies configuration
- Enables space to be saved in the control cabinet
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Very high long-term stability
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✓
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✓
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✓
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- Provides safe protection for the loads even after years of use in harsh operating conditions
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Wide setting ranges
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--
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✓
(1:4)
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✓
(1:4)
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- Minimize the configuration overhead and costs
- Minimize storage overhead, storage costs, tied-up capital
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Fixed trip class
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CLASS 10,
CLASS 10A
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3RB30:
CLASS 10E or
CLASS 20E
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3RB20:
CLASS 10E or
CLASS 20E
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- Optimum motor protection for standard starts
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Trip classes adjustable on the device CLASS 5E, 10E, 20E, 30E
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--
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✓
(only 3RB31)
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✓
(only 3RB21)
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- Enable solutions for very fast starting motors requiring special protection (e.g. Ex motors)
- Enable heavy starting solutions
- Reduce the number of versions
- Minimize the configuring outlay and costs
- Minimize storage overhead, storage costs, tied-up capital
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Low power loss
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--
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✓
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✓
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- Reduces power consumption and energy costs (up to 98% less power is used than for thermal overload relays)
- Minimizes temperature rises of the contactor and control cabinet – in some cases this may eliminate the need for control cabinet cooling
- Direct mounting to contactor saves space, even for high motor currents (i.e. no heat decoupling is required)
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Internal power supply
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--3)
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✓
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✓
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- Eliminates the need for configuration and connecting an additional control circuit
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