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1SAZ741201R1033 ABB TF42-3.1B Thermal Overload Relay 2.3 … 3.1 A
ABB 1SAZ741201R1033 TF42-3.1B is a Class 10 railway thermal overload relay with an adjustable 2.30–3.10 A range, phase-failure sensitivity and selectable automatic or manual reset.
£50.81
Why Choose the ABB 1SAZ741201R1033 TF42-3.1B Thermal Overload Relay?
The ABB 1SAZ741201R1033, also designated the TF42-3.1B, is a compact and reliable thermal overload relay for railway applications. It is designed to protect motors against sustained overloads and phase failure while meeting the demanding environmental requirements of railway rolling-stock equipment.
Three bimetal tripping elements monitor the current flowing through the motor circuit. When an overload or phase-failure condition causes excessive heating, the relay operates its auxiliary contacts so the associated contactor can disconnect the motor before damaging temperatures are reached.
With an adjustable current range of 2.30–3.10 A and a Class 10 tripping characteristic, the TF42-3.1B supports motors with normal starting duties. Temperature compensation, selectable automatic or manual reset, a trip-free mechanism and dedicated test and stop functions simplify reliable integration into railway motor-control assemblies.
Key Advantages
- Reliable motor protection against overload and phase failure.
- Designed for demanding railway rolling-stock applications.
- Adjustable 2.30–3.10 A current setting range.
- Class 10 tripping characteristic for normal motor starting duties.
- Selectable automatic or manual reset supports different control requirements.
- Compact design integrates directly with compatible ABB contactors.
Key Features
- ABB TF42-B railway thermal overload relay series.
- Three-pole electromechanical construction.
- Adjustable thermal range of 2.30–3.10 A.
- Class 10 tripping characteristic.
- Three bimetal tripping elements.
- Temperature-compensated overload protection.
- Phase-failure sensitivity.
- 1 normally closed trip contact and 1 normally open signal contact.
- Automatic or manual reset selection.
- Integrated stop, test and trip-indication functions.
Reliable Motor Protection for Railway Equipment
Thermal overload relays protect motors by responding to the heating effect created by excessive current. If the configured current is exceeded for long enough, the bimetal elements operate the relay contacts and cause the motor contactor to open, helping prevent winding and insulation damage.
The TF42-3.1B is engineered for railway rolling-stock applications where vibration, temperature changes and demanding operational conditions require dependable components. Its phase-failure sensitivity provides additional protection when one phase of a three-phase supply is interrupted or becomes severely unbalanced.
Typical Applications
- Railway rolling-stock motor-control systems.
- Train ventilation and air-conditioning equipment.
- Railway pumps, fans and compressors.
- Door, actuator and auxiliary drive systems.
- Rail vehicle electrical control panels.
- Industrial motor starters requiring railway-compliant components.
Technical Specifications
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| Compatible With | AF09–AF38 | |
|---|---|---|
| Mounting Type | Direct mount on contactor | |
| Device Type | Thermal Overload Relay | |
| Current Range | 2.3–3.1 A | |
| Trip Class | Class 10 | |
| Reset Type | Manual / Automatic | |
| Poles | 3-pole | |
| Manufacturer | ABB | |
| Series | TF42-B | |
| Model | TF42-3.1B | |
| Order code | 1SAZ741201R1033 | |
| Product type | Railway thermal overload relay | |
| Number of poles | 3 | |
| Current adjustment range | 2.30–3.10 A | |
| Trip class | 10 | |
| Tripping elements | 3 bimetal elements | |
| Auxiliary contacts | 1 normally closed trip contact and 1 normally open signal contact | |
| Reset method | Selectable automatic or manual | |
| Short-circuit protection fuse | 10 A gG | |
| Protection rating | IP20 | |
| Pollution degree | 3 | |
| Weight | 0.13 kg | |
| EAN | 4013614517129 |
Frequently Asked Questions
What is the ABB 1SAZ741201R1033 used for?
The TF42-3.1B protects motors in railway applications against sustained overloads and phase-failure conditions.
What current range does the TF42-3.1B support?
The thermal overload setting can be adjusted between 2.30 and 3.10 A to match the motor’s rated current.
What trip class does this overload relay have?
The ABB TF42-3.1B has a Class 10 tripping characteristic suitable for motors with normal starting times.
Can the TF42-3.1B be reset automatically or manually?
Yes. The relay allows the installer to select either automatic or manual reset according to the control-system requirements.
What auxiliary contacts are included?
The relay includes one normally closed trip contact and one normally open signal contact for contactor control and fault indication.
Trusted Railway Motor Protection from ABB
ABB TF42-B thermal overload relays provide dependable overload and phase-failure protection for railway rolling stock, combining adjustable motor protection with robust electromechanical operation.
