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1SAZ721201R1021 — Thermal overload relay
relayPart number: 1SAZ721201R1021
ABB TF42-0.74 (1SAZ721201R1021) is an electromechanical thermal overload relay for motor overload and phase-loss protection. It has an adjustable 0.55–0.74 A range, trip class 10, one normally closed and one normally open auxiliary contact, and selectable manual or automatic reset.
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Technical specifications
| Manufacturer | ABB |
|---|---|
| Part number | 1SAZ721201R1021 |
| Category | Electrical & controls |
| Ex Operating Instructions | ATEX - Operating instructions for thermal overload relay TF42 for potentially explosive areas |
| Time-Current Characteristic Curve | Tripping characteristic - Thermal overload relay TF42-0.74 |
| Product Net Width | 45 mm |
| Product Net Height | 88.3 mm |
| Product Net Depth / Length | 70.5 mm |
| Product Net Weight | 0.13 kg |
| Setting Range | 0.55–0.74 A |
| Rated Operational Voltage | Auxiliary Circuit 600 V AC/DC |
| Rated Operational Current (I e ) | 0.74 A |
| Rated Frequency (f) | Auxiliary Circuit 50 Hz |
| Rated Impulse Withstand Voltage (U imp ) | Auxiliary Circuit 6 kV |
| Rated Insulation Voltage (U i ) | 690 V |
| Number of Poles | 3P |
| Number of Auxiliary Contacts NC | 1 |
| Number of Auxiliary Contacts NO | 1 |
| Number of Protected Poles | 3 |
| Conventional Free-air Thermal Current (I th ) | Auxiliary Circuit NC 6 A |
| Rated Operational Current AC-15 (I e ) | (120 V) NC 3 A |
| Rated Operational Current DC-13 (I e ) | (125 V) NC 0.55 A |
| Degree of Protection | IP20 |
| Connecting Capacity Auxiliary Circuit | Flexible with Ferrule 1/2x 0.75 ... 2.5 mm² |
| Connecting Capacity Main Circuit | Flexible with Ferrule 1/2x 0.75 ... 4 mm² |
| Tightening Torque | Auxiliary Circuit 1 ... 1.2 N·m |
| Wire Stripping Length | Auxiliary Circuit 9 mm |
| Power Loss | at Rated Operating Conditions per Pole 1.1 ... 2.0 W |
| Maximum Operating Voltage UL/CSA | Main Circuit 600 V AC |
| Contact Rating UL/CSA | (NC:) B600 |
| Connecting Capacity Main Circuit UL/CSA | Flexible 1/2x 18-10 AWG |
| Published component type | Thermal overload relay |
| Reference status | Published part reference; specification and fitment require confirmation |
| Availability | On request |
| Trip Class | 10 |
| Reset Mode | Manual or automatic, selectable |
| Terminal Type | Screw connection |
| Protection Functions | Motor overload and phase-loss sensitivity |
Catalogue information may contain errors or be out of date. Full specifications and verified details are available on request. Confirm the part number and equipment fitment with us before ordering.
Product questions
What current range and trip class does the ABB TF42-0.74 cover?
ABB 1SAZ721201R1021 is the TF42-0.74 thermal overload relay, with an adjustable current range of 0.55 to 0.74 A and trip class 10. Check the motor nameplate and starter design when selecting the relay.
What protection and auxiliary contacts does this relay provide?
The relay provides motor overload protection and is sensitive to phase loss. It has one normally closed auxiliary contact and one normally open auxiliary contact for control and signalling.
Can the TF42-0.74 be reset manually or automatically?
Both manual and automatic reset modes are selectable. The relay also has test and stop functions and a trip indication.
How is the TF42-0.74 mounted?
The relay is designed for direct mounting on a matching contactor; a separate mounting kit can be used for standalone mounting. Confirm the contactor model and equipment details, including serial number where applicable, before ordering.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.