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ABB 2CDS251001R0278 — 1-Pole MCB (DIN Rail)

ABB 2CDS251001R0278 1-Pole MCB, Z Curve, 2 A, 6 kA Icn

MPN2CDS251001R0278

ABB 1-Pole MCB (DIN Rail), Z curve, 2 A, 440 V rated insulation, 6 kA Icn / 20 kA Icu, IP20/IP40, 17.5 mm width, 69 mm depth, DIN rail mount.

$71.40 – $75.90Ref. price · indicative, final on quote
ABB 2CDS251001R0278 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

2CDS251001R0278 — Electrical & Protection
ParameterValue
Overvoltage categoryIII
2CDS251001R0278 — Mounting & Connection
ParameterValue
Width17.5 mm
Height88 mm
Depth69 mm
2CDS251001R0278 — Other specifications
ParameterValue
Poles1
IP ratingIP20;IP40
MountingDIN Rail Mount
Current2 A
Terminal contact typeBi-Directional Cylinder Lift
Voltage440 V
Tripping characteristicsZ
Tightening torque - Screw-Type max.2.8 Nm
Rated Short-Circuit breaking capacity icn6 kA
Rated Short-Circuit breaking capacity icu20 kA

Product details

It's built for DIN rail mounting and carries an IP20 / IP40 ingress rating, making it a straightforward fit inside a panel or enclosure. The Z curve is the key spec here — it trips fast on small overcurrents, which means it's intended for sensitive electronic loads like PLC power supplies, control transformers, or semiconductor circuits where a standard B or C curve would let through too much energy before opening.

Rated short-circuit breaking capacity Icn is 6 kA, and ultimate breaking capacity Icu is 20 kA.

Width is 17.5 mm, depth 69 mm, height 88 mm. Terminal accepts up to 2.8 Nm tightening torque.

Frequently asked questions

What is the Z tripping characteristic used for?

The Z curve trips between 2 and 3 times rated current (4–6 A for this 2 A breaker), making it suitable for protecting sensitive electronic loads such as PLC power supplies, control transformers, and semiconductor circuits where standard B or C curves would allow excessive let-through energy.

What is the difference between Icn and Icu on this breaker?

Icn (6 kA) is the rated short-circuit breaking capacity per the IEC/EN 60898-1 standard for household-type MCBs. Icu (20 kA) is the ultimate breaking capacity per IEC/EN 60947-2 for industrial applications. The higher Icu rating allows use in panels with higher prospective fault current when coordinated with upstream protection.

MPN
2CDS251001R0278