Description

Application Scenarios

In a high-volume packaging machinery manufacturing facility, the Siemens 3RV1011-1GA20 protects the 0.25 kW conveyor drive motors that keep production lines moving 24/7. Before upgrading to the SIRIUS protection system, the plant experienced frequent nuisance tripping from standard miniature circuit breakers (MCBs) during motor startup, leading to production halts and frustrated maintenance teams. Standard MCBs lack the specific motor-starting curve required for applications with high inrush currents—they trip too fast during startup but may not respond quickly enough to genuine overload conditions.

After retrofitting the control panels with the Siemens 3RV1011-1GA20, the nuisance tripping issues were virtually eliminated. The integrated thermal-magnetic design of the Siemens 3RV1011-1GA20 allows the motor to draw its normal 6–8x startup current for several seconds without tripping, yet responds instantly when a locked-rotor or short-circuit condition occurs. The maintenance supervisor reported a 75% reduction in unplanned downtime related to motor protection trips during the first six months, while the space savings from combining two protection devices into one 45 mm module enabled the addition of two extra I/O modules in each control cabinet.

Parameters

Main Parameters	Value/Description
Product Model	3RV1011-1GA20
Manufacturer	Siemens AG
Product Category	Motor Protection Circuit Breaker (MPS)
Product Series	SIRIUS 3RV10
Frame Size	S00
Number of Poles	3
Adjustable Overload Current Range	1.8 – 2.5 A (thermal release)
Short-Circuit Release Current	13 A (magnetic instantaneous trip)
Rated Insulation Voltage	690 V AC
Rated Operating Voltage	20 – 690 V AC
Maximum Breaking Capacity (Icu)	100 kA @ 400 V AC
Trip Class	CLASS 10 (7.2× In overload trip in 4–10 sec)
Mechanical/Electrical Endurance	100,000 operating cycles (typical)
Power Loss (per pole, hot state)	1.8 W
Width	45 mm
Height	90 mm
Depth	75 mm
Net Weight	0.225 kg
Mounting Method	35 mm DIN rail (DIN EN 60715), any position
Ambient Temperature (operation)	-20°C to +60°C
Protection Class (front)	IP20 (finger-safe)
Certifications	CE, UL, CSA, CCC, IECEx, ATEX, ABS, BV, DNV, LR, RINA
Safety Approvals	IEC 61508 (Type A), ISO 13849 (Category 3)

Technical Principles and Innovative Values

Innovation Point 1: Thermal-Magnetic Dual Protection in a Single Compact Unit
The Siemens 3RV1011-1GA20 integrates both overload and short-circuit protection using a bimetallic thermal element and a magnetic instantaneous trip coil. This design eliminates the need for separate thermal overload relays and fuses, reducing panel wiring complexity by nearly 50% compared to traditional discrete protection schemes. The Class 10 tripping characteristic ensures the motor can handle startup surges (up to 8x rated current for several seconds) while still providing precise protection during sustained overload conditions.

Innovation Point 2: SIRIUS Ecosystem Integration
The Siemens 3RV1011-1GA20 is engineered for direct mechanical and electrical interfacing with SIRIUS 3RT10 contactors, enabling fuseless motor starter assemblies that reduce component count and installation time. This modular approach simplifies panel design, lowers material costs, and improves system reliability by reducing potential failure points in the wiring harness.

Innovation Point 3: Exceptional Short-Circuit Breaking Capacity
With a rated short-circuit breaking capacity of 100 kA at 400 V AC, the Siemens 3RV1011-1GA20 delivers protection performance typically associated with much larger devices. This capability ensures safe clearing of fault currents even in installations with high available short-circuit current—such as facilities with large transformers or low-impedance power distribution systems—without requiring additional upstream fuses in most configurations.

Innovation Point 4: Long Service Life and High Reliability
The Siemens 3RV1011-1GA20 offers a typical mechanical and electrical endurance of 100,000 operating cycles, ensuring years of trouble-free service in high-frequency switching applications. This durability translates directly to lower lifecycle costs and reduced maintenance interventions for end-users.