Monitoring Relays for Generators and ATS Systems
How phase-sequence, voltage/frequency and temperature monitoring relays let an ATS safely transfer a load onto a standby generator and back.
- Part number
- 1SCA151250R1001
- Model no
- OTM125F4C20D400C
Compact ATSABB 1SCA151250R1001 OTM125F4C20D400C 4P 2.5 kA Icw Automatic Transfer Switch
ABB OTM125F4C20D400C - 125A 4P self-supplied automatic transfer switch, fixed control, 2.5kA Icw, 380-415V AC.
Description
About the OTM125F4C20D400C
About the OTM125F4C20D400C
Rated 125 A across 4 poles, the ABB 1SCA151250R1001 OTM125F4C20D400C is a self-supplied compact automatic transfer switch for 380-415 V AC mains-generator installations. Its type 20D control unit carries fixed operating parameters set at the factory, which keeps commissioning simple where the switching logic does not need field adjustment. It withstands 2.5 kA for 1 s and mounts on a DIN rail or base plate.
Selection Notes
Four switched poles put the 1SCA151250R1001 in the neutral-switching bracket of the 125 A Compact ATS range, needed where the installation isolates neutral between the two sources rather than bonding it on both sides. The 20D controller fixes the voltage thresholds and switching delay at the factory, so there is no field configuration step beyond wiring. Where a project needs those thresholds adjustable on site, the 21D version in the same 125 A, 4-pole frame is the alternative; pick this unit when the standard settings already match the installation.
Specification
Full specification
Material Compliance 1
| RoHS Information | Following EU Directive 2011/65/EU and Amendment 2015/863 July 22, 2019 |
|---|
Environmental 2
| Degree of Protection | Front IP20 |
|---|---|
| Pollution Degree | 3 |
Dimensions 4
| Product Net Width | 286 mm, 11.26 in |
|---|---|
| Product Net Height | 103 mm, 4.06 in |
| Product Net Depth / Length | 131 mm, 5.16 in |
| Product Net Weight | 2 kg, 4.41 lb |
Show all 56 specifications ↓ Show less ↑49 more values in Identification, Technical, External Classifications and Standards, Logistics.
Identification 12
| Part number | 1SCA151250R1001 |
|---|---|
| Type designation | OTM125F4C20D400C |
| Brand | ABB |
| Condition | New, factory sealed |
| Source | ABB and its authorised distributors |
| Warranty | Manufacturer warranty |
| EAN | 6417019815633 |
| ETIM class | EC000216 |
| eCl@ss | 27371403 |
| Minimum Order Quantity | 1 piece |
| Customs Tariff Number | 85365080 |
| Country of Origin | China |
Technical 23
| Controller Type | 20D |
|---|---|
| Conventional Free-air Thermal Current (Ith) | Θ = 40 °C 125 A |
| Fourth Pole Type | Switched - Simultaneous Function |
| Handle Type | Direct Mount |
| Motor Operational Voltage | 380…415 V AC |
| Mounting Type | Base Mounting Or DIN-rail mounting |
| Number of Poles | 4P |
| Position of Line Terminals | Supplies on Top - Load on Bottom |
| Power Loss | at Rated Operating Conditions per Pole 6.3 W |
| Rated Impulse Withstand Voltage (Uimp) | 8 kV |
| Rated Insulation Voltage (Ui) | 800 V |
| Rated Operational Current AC-21A (Ie) | (380 ... 415 V) 125 A |
| Rated Operational Current AC-22A (Ie) | (380 ... 415 V) 125 A |
| Rated Operational Current AC-23A (Ie) | (380 ... 415 V) 90 A |
| Rated Operational Current AC-31B (Ie) | (380 ... 415 V) 125 A |
| Rated Operational Current AC-32B (Ie) | (380 ... 415 V) 125 A |
| Rated Operational Current AC-33B (Ie) | (380 ... 415 V) 80 A |
| Rated Operational Power AC-23A (Pe) | (380 ... 415 V) 45 kW |
| Rated Operational Voltage | Main Circuit 380…415 V |
| Rated Short-time Withstand Current Low Voltage (Icw) | for 1 s 2.5 kiloampere rms |
| Terminal Type | Screw Terminals |
| Tightening Torque | acc. IEC 60947-1 6 N·m |
| Transition Type | Open |
External Classifications and Standards 4
| ETIM 10 | EC000216 - Switch disconnector (AC) |
|---|---|
| UNSPSC | 39122214 |
| eClass | V11.1 : 27371403 |
| WEEE Category | 5. Small Equipment (No External Dimension More Than 50 cm) |
Logistics 10
| Package Level 1 Units | box 1 piece |
|---|---|
| Package Level 1 Width | 103 mm |
| Package Level 1 Depth / Length | 328 mm |
| Package Level 1 Height | 168 mm |
| Package Level 1 Gross Weight | 2.25 kg |
| Package Level 1 EAN | 6417019815633 |
| Shipping weight | 2.0 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 02 Oct 2026
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Quick answers
Questions about the OTM125F4C20D400C
What is the rated current of OTM125F4C20D400C?
The rated current of OTM125F4C20D400C is 125 A.
Which supply voltage is OTM125F4C20D400C rated for?
The rated operational voltage of OTM125F4C20D400C is 380–415 V AC.
What is the HS code of OTM125F4C20D400C for customs?
The tariff (HS) code on file for OTM125F4C20D400C is 853650.
What is the EAN of OTM125F4C20D400C?
The EAN (GTIN) of OTM125F4C20D400C is 6417019815633.
Where does OTM125F4C20D400C ship from, and how fast?
OTM125F4C20D400C ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
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Series
ABB Compact ATS
- Brand
- ABB
- Series
- Compact ATS
