chapter 52 (EN)

Protection Equipment

Protection Equipment General data - Overview Overload Relays 3RU1 Thermal Overload Relays 3RU11 for standard applications - Overview - Design - Function - Technical specifications - Characteristic curves - Dimensional drawings - Schematics Accessories 3RB2 Solid-State Overload Relays 3RB20, 3RB21 for standard applications - Overview - Design - Function - Technical specifications - Characteristic curves - Dimensional drawings - Schematics 3RB22, 3RB23 for high-feature applications - Overview - Design - Function - Technical specifications - Characteristic curves - Dimensional drawings - Schematics Accessories Siemens · 2009 4 8 8 9 10 15 16 17 18 19 19 20 21 26 27 28 29 30 31 33 38 39 41 43

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General data

Overload Relays General data Overview 1) Motor currents up to 820 A can be recorded and evaluated by a current measuring module, e. g. 3RB29 06-2BG1 (0.3 ... 3 A), in combination with a 3UF18 68-3GA00 (820 A/1 A) series transformer. 2) The SIRIUS 3RN thermistor motor protection devices can be used to pro- vide additional temperature-dependent protection.

4 Siemens · 2009 Features Benefits 3RU11 3RB20/3RB21 3RB22/3RB23 3RU11 3RB20/3RB21 3RB22/3RB23 General data Sizes • Are coordinated with the dimensions, connections and technical characteristics of the other devices in the SIRIUS modular system (contactors, soft starters, ...) • Permit the mounting of slim and compact load fee- ders in widths of 45 mm (S00), 45 mm (S0), 55 mm (S2), 70 mm (S3), 120 mm (S6) and 145 mm (S10/S12) • Simplify configuration S00 ...S3 S00 ... S12 S00 ... S12 Seamless current range • Allows easy and consistent configuration with one series of overload relays (for small to large loads) 0.11 ... 100 A 0.1 ... 630 A 0.3 ... 630 A (...

820 A)1) Protection functions Tripping in the event of overload • Provides optimum inverse-time delayed protection of loads against excessive temperature rises due to overload ✔ ✔ ✔ Tripping in the event of phase unbalance • Provides optimum inverse-time delayed protection of loads against excessive temperature rises due to phase unbalance (✔) ✔ ✔ Tripping in the event of phase failure • Minimizes heating of induction motors during pha- se failure ✔ ✔ ✔ Protection of single-phase loads • Enables the protection of single-phase loads ✔ -- ✔ Tripping in the event of overheating by integrated thermistor motor protection function • Provides optimum temperature-dependent pro- tection 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 for long starting or braking opera- tions • Eliminates the need for additional special equipment • Saves space in the control cabinet • Reduces wiring outlay and costs --2) --2) ✔ Tripping in the event of a ground fault by internal ground-fault detection (activatable) • Provides optimum protection of loads against high-resistance short-circuits or ground faults due to moisture, condensed water, damage to the in- sulation material, etc. • Eliminates the need for additional special equipment.

• Saves space in the control cabinet • Reduces wiring outlay and costs -- ✔ (only 3RB21) ✔ Features RESET function • Allows manual or automatic resetting of the relay ✔ ✔ ✔ Remote RESET function • Allows the remote resetting of the relay ✔ (by means of sepa- rate module) ✔ (only 3RB21 with 24 V DC) ✔ TEST function for auxiliary contacts • Allows easy checking of the function and wiring ✔ ✔ ✔ TEST function for electronics • Allows checking of the electronics -- ✔ ✔ Status display • Displays the current operating state ✔ ✔ ✔ Large current adjustment button • Makes it easier to set the relay exactly to the cor- rect current value ✔ ✔ ✔ Integrated auxiliary contacts (1 NO + 1 NC) • Allows the load to be switched off if necessary • Can be used to output signals ✔ ✔ ✔ (2 ×)

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General data

Overload Relays General data 1) Exception: up to size S3, only stand-alone installation is possible. 2) Alternatively available for screw terminals.

5 Siemens · 2009 Features Benefits 3RU11 3RB20/3RB21 3RB22/3RB23 3RU11 3RB20/3RB21 3RB22/3RB23 Design of load feeders Short-circuit strength up to 100 kA at 690 V (in conjunction with the corresponding fuses or the corresponding motor starter protector) • Provides optimum protection of the loads and ope- rating personnel in the event of short-circuits due to insulation faults or faulty switching operations ✔ ✔ ✔ Electrical and mechanical matching to 3RT1 contactors • Simplifies configuration • Reduces wiring outlay and costs • Enables stand-alone installation as well as space- saving direct mounting ✔ ✔ ✔1) Straight-through transformers for main circuit2) (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) • Reduces the contact resistance (only one point of contact) • Saves wiring costs (easy, no need for tools, and fast) • Saves material costs • Reduces installation costs -- ✔ (S2 ...

S6) ✔ (S00 ...

S6) Spring-type terminal connection sys- tem for main circuit2) • Enables fast connections • Permits vibration-resistant connections • Enables maintenance-free connections ✔ (S00) -- -- Spring-type terminal connection sys- tem for auxiliary circuits2) • Enables fast connections • Permits vibration-resistant connections • Enables maintenance-free connections ✔ ✔ ✔ Other features Temperature compensation • 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 ✔ ✔ ✔ Very high long-term stability • Provides safe protection for the loads even after years of use in severe operating conditions (✔) ✔ ✔ Wide setting ranges • Reduce the number of variants • Minimize the engineering outlay and costs • Minimize storage overhead, storage costs, tied-up capital -- ✔ (1:4) ✔ (1:10) Trip class CLASS 5 • Enables solutions for very fast starting motors re- quiring special protection (e.

g. Ex motors) -- ✔ (only 3RB21) ✔ Trip classes > CLASS 10 • Enables heavy starting solutions -- ✔ ✔ Low power loss • Reduces power consumption and energy costs (up 98 % less power is used than for thermal over- load relays). • Minimizes temperature rises of the contactor and control cabinet – in some cases this may eliminate the need for controlgear cabinet cooling. • Direct mounting to contactor saves space, even for high motor currents (i. e. no heat decoupling is required). -- ✔ ✔

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General data

Overload Relays General data 1) The SIRIUS 3RU11 thermal overload relays use a bimetal contactor and therefore do not require a control supply voltage.

6 Siemens · 2009 Features Benefits 3RU11 3RB20/3RB21 3RB22/3RB23 3RU11 3RB20/3RB21 3RB22/3RB23 Other features Internal power supply • Eliminates the need for configuration and connec- ting an additional control circuit --1) ✔ -- Variable adjustment of the trip classes (The required trip class can be adjusted by means of a rotary switch depending on the current start-up condition.) • Reduces the number of variants • Minimizes the configuring outlay and costs • Minimizes storage overhead, storage costs, and tied-up capital -- ✔ (only 3RB21) ✔ Overload warning • Indicates imminent tripping of the relay directly on the device due to overload, phase unbalance or phase failure • Allows the imminent tripping of the relay to be signaled • Allows measures to be taken in time in the event of continuous inverse-time delayed overloads • Eliminates the need for an additional device • Saves space in the control cabinet • Reduces wiring outlay and costs -- -- ✔ Analog output • Allows the output of an analog output signal for ac- tuating moving-coil instruments, feeding program- mable logic controllers or transfer to bus systems • Eliminates the need for an additional measuring transducer and signal converter • Saves space in the control cabinet • Reduces wiring outlay and costs -- -- ✔

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