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The Siemens 3RB2036-1UB0 is a SIRIUS 3RB2 series solid-state overload relay designed for current-sensitive protection of three-phase motors. It provides reliable protection against overload, phase failure, and phase imbalance, with an adjustable current setting range of 12.5 to 50 A and Class 10 tripping characteristics.
As a solid-state (electronic) relay, it offers superior accuracy and reliability compared to traditional thermal overload relays. The unit is designed for direct mounting onto SIRIUS S2 contactors (such as 3RT1033 through 3RT1036) or can be installed separately using a DIN rail or base-mounted bracket . Its internal power supply eliminates the need for external control voltage, simplifying wiring and commissioning.
Artikelnummer :
3RB2036-1UB0Bestellung (Mindestbestellmenge) :
1Zahlung :
EXWProduktursprung :
GermanyVerschiffungshafen :
Wuhan, Hubei, ChinaLieferzeit :
3-5 daysGewicht :
0.359kgOverview
3RB2036-1UB0 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
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| Part Number | Description | Key Difference |
|---|---|---|
| 3RB2036-1UB0 | Class 10, 12.5–50 A, screw terminals (this item) | Standard Class 10 protection |
| 3RB2036-2UB0 | Class 20, 12.5–50 A | Slower trip for heavy-starting motors |
| 3RB2036-1QB0 | Class 10, 12.5–50 A, spring terminals | Spring-clamp auxiliary connections |
| 3RT1035-1AB04 | S2 Contactor, 22 kW | Compatible contactor for direct mounting |
| 3RU2136-4UB0 | Thermal overload relay, 12.5–50 A | Bimetallic alternative |
1 × Siemens 3RB2036-1UB0 SIRIUS Solid-State Overload Relay
Note: Contactor, mounting bracket, and DIN rail are sold separately.
In Stock – Ready to ship immediately
Genuine Siemens Product – Factory original component
Warranty Included – Purchase with confidence
Technical Support – Compatibility assistance available
Q1: What is the Siemens 3RB2036-1UB0?
It is a SIRIUS 3RB2 series solid-state overload relay for three-phase motor protection. It provides overload, phase failure, and phase imbalance protection with an adjustable current range of 12.5 to 50 A and Class 10 tripping characteristics .
Q2: What is the difference between this and a thermal overload relay?
The 3RB2036-1UB0 uses solid-state electronics for current sensing, while thermal relays use bimetallic strips. Electronic relays offer better accuracy, repeatability, and immunity to ambient temperature variations compared to thermal types .
Q3: What is Class 10 tripping?
Class 10 means the relay will trip within 10 seconds or less at 7.2 times the set current. This is suitable for standard motors with normal starting characteristics .
Q4: Can this relay be mounted separately from a contactor?
Yes. While designed for direct mounting onto S2 contactors, it can be installed separately using a DIN rail adapter or base-mounted bracket .
Q5: What contactors is this relay compatible with?
It is designed for direct mounting onto Siemens SIRIUS S2 contactors, specifically the 3RT1033, 3RT1034, 3RT1035, and 3RT1036 models .
Q6: What is the difference between the 1UB0 and 2UB0 variants?
The 1UB0 (this item) is Class 10 (trips in ≤10 seconds). The 2UB0 is Class 20 (trips in ≤20 seconds), which is better suited for motors with heavy or long starting times .
Q7: Does this relay require an external power supply?
No. The 3RB20 series has an internal power supply and is self-powered from the main circuit current .
Q8: What auxiliary contacts are included?
The relay includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact .
Q9: What is the operating temperature range?
The relay operates from -25°C to +60°C .
Q10: What should I verify before ordering?
Always verify the motor full-load current falls within the 12.5–50 A setting range, confirm your contactor is an S2 frame (3RT1033–1036) if direct mounting is required, and ensure the Class 10 trip characteristic matches your motor's starting profile.
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