Schneider Electric A9N61501 Acti9 C60H-DC 1P 1 A C-Curve DC MCB

A9N61501: Acti9 C60H-DC 1P 1 A C-curve DC miniature circuit breaker

The A9N61501 is a Schneider Electric Acti9 C60H-DC miniature circuit-breaker, single-pole, rated 1 A at 25 °C with a C curve and a thermal-magnetic trip unit. It is built for direct-current circuits (the datasheet lists network type DC) up to 250 V DC rated operational voltage, which makes it a protection device for battery banks, DC control supplies, solar strings and telecom or substation DC systems rather than AC distribution. Seven Star LLC supplies the A9N61501 in Oman and the GCC as an independent supplier based in Muscat.

The product title gives the family (C60H-DC), the pole count (1 pole), the rating (1 A) and the curve (C). A9N61501 has polarity markings on its terminals, which is why correct connection of positive and negative matters more than on an AC breaker.

Technical specifications of the A9N61501

Why a DC breaker is not an AC breaker: the A9N61501

An AC current passes through zero 100 or 120 times per second, which helps the arc extinguish; a DC arc has no natural zero crossing, so a breaker for DC needs an arc chamber and often a permanent magnet or specific polarity to blow the arc out. This is why the C60H-DC is marked with positive and negative terminals and why the datasheet gives its breaking capacity per DC voltage rather than a single AC figure. For this unit the values are 20 kA at 110 V DC, 10 kA at 220 V DC and 6 kA at 250 V DC: the capacity falls as the voltage rises, because a higher voltage makes the arc harder to extinguish.

Do not install it on an AC circuit and do not reverse the polarity unless the manufacturer’s wiring diagram shows how.

Rating, curve and trip behaviour

The A9N61501 is rated 1 A, the lowest current in its range, and has a C curve: the magnetic element releases at a multiple of the rated current, which for such a small rating is a very low absolute current. It is therefore well suited to protecting a small DC load, a control circuit, a sensor supply or a monitoring device from an upstream DC bus. The 1 A figure is defined at 25 °C; the datasheet lists an operating range of -25–70 °C, so the current at which the thermal element trips shifts with ambient temperature, something to remember in outdoor DC enclosures in the Gulf. Electrical endurance is 3000 cycles on an inductive load with L/R = 2 ms; the mechanical endurance of 20000 cycles is higher because it counts no-load operations.

Selection checklist and RFQ details for the A9N61501

Check these points.

• System voltage: up to 250 V DC, and the prospective short-circuit current of the source at that voltage.
• Polarity: terminals marked, so wiring drawings must show positive and negative.
• Load: 1 A rated current, against the cable and the load.
• Space: 18 mm of rail.
• Lockout: padlock in position O.

With your enquiry, send:

• Part number A9N61501 and quantity.
• DC system voltage and source type (battery, rectifier, PV).
• Delivery location and date.

Installation and wiring of the A9N61501

The breaker is two modules (18 mm) wide and mounts on a 35 mm rail. It is compatible with comb busbars at top or bottom, so several DC branches can share a busbar. Tighten the power terminals to 2.5 N.m. The toggle can be padlocked in the O (open) position, which is the correct way to lock out a DC branch before maintenance. In battery circuits, always make the positive and negative connections to the terminals marked on the breaker, check polarity with a meter before closing, and remember that a battery bank remains live even when the charger is off. The datasheet lists no earth-leakage option for this device; insulation monitoring is handled elsewhere on the DC system.

Breaking capacity of the A9N61501 by DC voltage

The datasheet gives the following ultimate (Icu) and service (Ics) breaking capacities to EN/IEC 60947-2. Ics is stated as 75 % of Icu.

Use the row at or above your system voltage, and compare it with the prospective short-circuit current of the battery or rectifier. A battery bank can deliver a very high fault current even at a low voltage, so verify the source data and not only the nominal voltage. The rated insulation voltage is 500 V DC with a 6 kV impulse withstand, and the overvoltage category is IV.

Where the A9N61501 is used in Oman and the GCC

DC breakers of this type are used on 24, 48, 110 and 220 V DC control and battery systems in substations, power plants, telecom sites and oil and gas facilities, and in small solar installations. A 1 A device typically feeds a single indicator, a protection relay supply or a field device. The temperature range of -25–70 °C and class 2 tropicalisation suit warm indoor battery rooms; outdoor cabinets in direct sun need shading or ventilation.

Documents and quotation

The manufacturer’s product datasheet for the A9N61501 is attached on this page for reference; it is the document to use when you verify ratings, dimensions and approvals against your own design. It lists the DC breaking capacities for this exact reference.

To receive a quotation, send the part number A9N61501 with quantity and delivery location in Oman or the GCC. Seven Star LLC replies with availability and lead time as an independent supplier based in Muscat.