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1250-1S-400 Bourns 1250 Series 1-pole general duty AC surge protective device. Rated 420V MCOV, 20kA nominal and 50kA max discharge current. UL 100kA SCCR, screw terminals, DIN Rail mount.
Mfr Part #:

1250-1S-400

Available from 1 distributors
Mfr Name: Bourns
Bourns
Bourns 1250 Series 1-pole general duty AC surge protective device. Rated 420V MCOV, 20kA nominal and 50kA max discharge current. UL 100kA SCCR, screw terminals, DIN Rail mount.
Total Stock: 7 pcs

1250-1S-400 Available from 1 distributors

Authorised
Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Non-Authorised Inventory information
7 pcs
7 pcs On Request 1 On Request On Request 1970-01-01 00:30:13 On Request On Request

1250-1S-400 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
AEC Qualified
Approval Agency
Automotive Grade
Connection Type
Current
Dimensions
Enclosure Material
Features
Form
IP Rating
Industrial Grade
Leakage Current
Max Continuous Operating Voltage (MCOV)
Maximum Discharge Current (Imax)
Medical Grade
Military Grade
Mounting Type
Nominal Discharge Current (In)
Number of Poles
Operating Altitude
Operating Temperature
Overcurrent Protection Rating
Relative Humidity
Remote Signaling
Short-Circuit Current Rating (SCCR)
TOV Withstand
Tape & Reel
Termination Style
Thermal Protection
Type
Voltage
Voltage Protection Rating (VPR)

1250-1S-400 Description

Short technical summary and product information.

The Bourns 1250-1S-400 is a 1-pole general duty AC Surge Protective Device (SPD) from the 1250 Series. It features a Max Continuous Operating Voltage (MCOV) of 420V and a TOV withstand of 440V. The device is rated for a nominal discharge current (In) of 20kA and a maximum discharge current (Imax) of 50kA per 8/20µs impulse. It achieves a Voltage Protection Rating (VPR) of 1200V and a Short-Circuit Current Rating (SCCR) of 100kA.

 

The SPD is designed for DIN Rail mounting and uses a base + module form factor. It offers screw terminal connections accepting up to #6 AWG wire. The enclosure is made of thermoplastic rated UL 94V0, and the device is IP20 rated. It includes remote signaling contacts and integrated thermal protection, along with a visual fault indicator. Operating temperature range is -50°C to 85°C, and it is suitable for altitudes up to 4000m. The 1250-1S-400 is RoHS compliant and carries CE, CSA, and UR approvals. It is intended for installation at service entrance and branch panels to protect against transient overvoltages.

1250-1S-400 Quick Information

Product Type: Surge Protective Device (SPD)
Series: 1250
Canonical Name: Bourns 1250 Series 1-Pole General Duty AC Surge Protective Device 420V MCOV
Subcategory: General Duty AC SPD

1250-1S-400 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

1250-1S-400 Features

  • 420V MCOV with 440V TOV withstand.
  • 20kA nominal, 50kA max discharge current.
  • 100kA short-circuit current rating.
  • DIN Rail mountable with screw terminals.
  • Integrated thermal protection and remote signaling.

1250-1S-400 Applications

  • Protection for service entrance and branch panels.
  • Ideal for single-phase AC power systems.
  • Use in IT, TT, TN, and delta systems.
  • Suitable for limited-space installations.

1250-1S-400 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the maximum continuous operating voltage (MCOV) of the 1250-1S-400?

The MCOV is 420V.

What are the nominal and maximum discharge current ratings?

Nominal discharge current (In) is 20kA, and maximum discharge current (Imax) is 50kA.

What is the voltage protection rating (VPR)?

The VPR is 1200V.

What is the short-circuit current rating (SCCR)?

The SCCR is 100kA.

What mounting type does this SPD use?

It is DIN Rail mountable.

Does the device have remote signaling capability?

Yes, it includes remote signaling contacts.

What are the operating temperature limits?

The operating temperature range is -50°C to 85°C.

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