Mersen Protistor Size 73 High-Speed aR Fuses (600-1250V)

The Mersen Protistor® size 73 aR line represents the highest standard in robust, high-speed semiconductor protection. Providing ultimate short-circuit defense and equipment flexibility, these square body fuses serve as uncompromising guardians for variable speed drives, un-interruptible power supplies, and other advanced power conversion electronics.

Product Overview

Engineered exclusively for demanding electrical industrial environments, the 1250V/1300V Protistor® series offers an unparalleled range encompassing 600 to 1250 VAC (IEC) ratings and extensive amperages scaling from 315A up to 1800A. Constructed with die-cut fine silver elements encased within highly pure, carefully solidified silica sand, these aR-class fuses masterfully regulate arcing characteristics. Paired with superior contact terminals and advanced clearing precision, this component series mitigates extensive collateral damage by yielding phenomenally low I²t values combined with excellent cyclic load capabilities. Additionally, integrators have access to wide-ranging mount setups globally supported by Mersen's versatile housing designs and fully non-magnetic subcomponents.

Typical Applications

  • Dramatically enhances operational safety in low and medium voltage IGBT devices and Thyristors.
  • Safeguards high-power UPS frameworks and multi-redundancy battery infrastructure systems.
  • Directly protects solid state converters, heavy duty variable frequency drives (VFDs), and AC/DC rectifiers.
  • Highly suited for critical facilities requiring dependable overcurrent protection under 690V or robust multi-voltage integrations.

Key Features & Benefits

  • aR Class optimization precisely meeting strict high-speed standards set by IEC 60269-4 / VDE 636-23.
  • Broad modularity achieved through various blade footprints including Metric threaded, Imperial threaded, DIN110, notched, and slotted mounts.
  • Extremely fast isolation properties delivering reduced unrecoverable equipment downtime and enhanced fault limitations.
  • Constructed for robust continuous lifecycle durability, offering phenomenal current-limiting capabilities and resilience under intense thermal cycling.

Product Range & Selection Guide

Size 73 TTF Terminals (M12 Threaded)

1250V AC (IEC) • 315A to 1800A • Rated Breaking Capacity to 200kA

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
PC73UD13C315TF Item: J300503 1250 V / 1300 V 315 A 126 kA REQUEST QUOTE
PC73UD13C350TF Item: K300504 1250 V / 1300 V 350 A 126 kA REQUEST QUOTE
PC73UD13C400TF Item: L300505 1250 V / 1300 V 400 A 126 kA REQUEST QUOTE
PC73UD13C450TF Item: M300506 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
PC73UD13C500TF Item: N300507 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
PC73UD13C550TF Item: P300508 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
PC73UD13C630TF Item: Q300509 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
PC73UD13C700TF Item: R300510 1250 V / 1300 V 700 A 126 kA REQUEST QUOTE
PC73UD13C800TF Item: S300511 1250 V / 1300 V 800 A 126 kA REQUEST QUOTE
PC73UD12C900TF Item: T300512 1200 V / 1300 V 900 A 126 kA REQUEST QUOTE
PC73UD10C1000TF Item: V300513 1000 V / 1100 V 1000 A 167 kA REQUEST QUOTE
PC73UD95V11CTF Item: W300514 950 V / 1000 V 1100 A 150 kA REQUEST QUOTE
PC73UD90V13CTF Item: T300696 900 V / 1000 V 1250 A 150 kA REQUEST QUOTE
PC73UD85V14CTF Item: S300718 850 V / 900 V 1400 A 150 kA REQUEST QUOTE
PC73UD69V16CTF Item: B301301 690 V / 700 V 1600 A 150 kA REQUEST QUOTE
PC73UD60V18CTF Item: C301302 600 V / 650 V 1800 A 200 kA REQUEST QUOTE

Size 73 TTI Terminals (1/2"-13 Unified Threaded)

1250V AC (IEC) • 315A to 1800A • Imperial Threads

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
A130UD73TTI315 Item: Z301046 1250 V / 1300 V 315 A 126 kA REQUEST QUOTE
A130UD73TTI350 Item: A301047 1250 V / 1300 V 350 A 126 kA REQUEST QUOTE
A130UD73TTI400 Item: B301048 1250 V / 1300 V 400 A 126 kA REQUEST QUOTE
A130UD73TTI450 Item: C301049 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
A130UD73TTI500 Item: D301050 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
A130UD73TTI550 Item: E301051 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
A130UD73TTI630 Item: F301052 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
A130UD73TTI700 Item: G301053 1250 V / 1300 V 700 A 126 kA REQUEST QUOTE
A130UD73TTI800 Item: H301054 1250 V / 1300 V 800 A 150 kA REQUEST QUOTE
A130UD73TTI900 Item: T1013903 1200 V / 1300 V 900 A 150 kA REQUEST QUOTE
A110UD73TTI1000 Item: K301056 1000 V / 1100 V 1000 A 167 kA REQUEST QUOTE
A100UD73TTI1100 Item: L301057 950 V / 1000 V 1100 A 150 kA REQUEST QUOTE
A100UD73TTI1250 Item: M301058 900 V / 1000 V 1250 A 150 kA REQUEST QUOTE
A090UD73TTI1400 Item: N301059 850 V / 900 V 1400 A 150 kA REQUEST QUOTE
A070UD73TTI1600 Item: Q300877 690 V / 700 V 1600 A 200 kA REQUEST QUOTE
A065UD73TTI1800 Item: R300878 600 V / 650 V 1800 A 200 kA REQUEST QUOTE

Size 73 DIN110 Blade Terminals

1250V AC (IEC) • 315A to 1100A • Broad System Compatibility

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
PC73UD13C315D1A Item: A300564 1250 V / 1300 V 315 A 126 kA REQUEST QUOTE
PC73UD13C350D1A Item: B300565 1250 V / 1300 V 350 A 126 kA REQUEST QUOTE
PC73UD13C400D1A Item: C300566 1250 V / 1300 V 400 A 126 kA REQUEST QUOTE
PC73UD13C450D1A Item: D300567 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
PC73UD13C500D1A Item: E300568 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
PC73UD13C550D1A Item: F300569 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
PC73UD13C630D1A Item: G300570 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
PC73UD12C700D1A Item: H300571 1200 V / 1300 V 700 A 150 kA REQUEST QUOTE
PC73UD11C800D1A Item: J300572 1100 V / 1200 V 800 A 150 kA REQUEST QUOTE
PC73UD10C900D1A Item: K300573 1000 V / 1100 V 900 A 167 kA REQUEST QUOTE
PC73UD90V11CD1A Item: M300575 900 V / 1000 V 1100 A 150 kA REQUEST QUOTE
PC73UD90V10CD1A Item: L300574 900 V / 1000 V 1000 A 150 kA REQUEST QUOTE

→ Continued: Mounting Variants (LI Slotted, EF Notched & PA Plain Blades)

Size 73 LI Slotted Blade Terminals

1250V AC (IEC) • 315A to 1400A • Pre-slotted direct installation mounts

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
A130UD73LI315 Item: B300680 1250 V / 1300 V 315 A 126 kA REQUEST QUOTE
A130UD73LI350 Item: C300681 1250 V / 1300 V 350 A 126 kA REQUEST QUOTE
A130UD73LI400 Item: D300682 1250 V / 1300 V 400 A 126 kA REQUEST QUOTE
A130UD73LI450 Item: E300683 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
A130UD73LI500 Item: F300684 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
A130UD73LI550 Item: G300685 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
A130UD73LI630 Item: H300686 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
A130UD73LI700 Item: J300687 1200 V / 1300 V 700 A 150 kA REQUEST QUOTE
A120UD73LI800 Item: K300688 1100 V / 1200 V 800 A 150 kA REQUEST QUOTE
A110UD73LI900 Item: L300689 1000 V / 1100 V 900 A 167 kA REQUEST QUOTE
A100UD73LI1000 Item: M300690 900 V / 1000 V 1000 A 150 kA REQUEST QUOTE
A100UD73LI1100 Item: N300691 900 V / 1000 V 1100 A 151 kA REQUEST QUOTE
A100UD73LI1250 Item: J301193 900 V / 1000 V 1250 A 151 kA REQUEST QUOTE
A090UD73LI1400 Item: K301194 850 V / 900 V 1400 A 126 kA REQUEST QUOTE

Size 73 EF Style Terminals (Notched Blades)

1250V AC (IEC) • 315A to 1100A • Enhanced fast-attachment integration

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
PC73UD13C315EF Item: V300628 1250 V / 1300 V 315 A 126 kA REQUEST QUOTE
PC73UD13C350EF Item: W300629 1250 V / 1300 V 350 A 126 kA REQUEST QUOTE
PC73UD13C400EF Item: X300630 1250 V / 1300 V 400 A 126 kA REQUEST QUOTE
PC73UD13C450EF Item: Y300631 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
PC73UD13C500EF Item: Z300632 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
PC73UD13C550EF Item: A300633 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
PC73UD13C630EF Item: B300634 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
PC73UD12C700EF Item: C300635 1200 V / 1300 V 700 A 150 kA REQUEST QUOTE
PC73UD11C800EF Item: D300636 1100 V / 1200 V 800 A 150 kA REQUEST QUOTE
PC73UD10C900EF Item: E300637 1000 V / 1100 V 900 A 167 kA REQUEST QUOTE
PC73UD90V10CEF Item: F300638 900 V / 1000 V 1000 A 150 kA REQUEST QUOTE
PC73UD90V11CEF Item: G300639 900 V / 1000 V 1100 A 150 kA REQUEST QUOTE

Size 73 PA Plain Blade Terminals

1250V AC (IEC) • 450A to 1400A • Flat surface mounts

Catalog Number Voltage (IEC/UL) Amp Rating Breaking Cap. Action
PC73UD13C450PA Item: X302976 1250 V / 1300 V 450 A 126 kA REQUEST QUOTE
PC73UD13C500PA Item: S302719 1250 V / 1300 V 500 A 126 kA REQUEST QUOTE
PC73UD13C550PA Item: Y302977 1250 V / 1300 V 550 A 126 kA REQUEST QUOTE
PC73UD13C630PA Item: D300843 1250 V / 1300 V 630 A 126 kA REQUEST QUOTE
PC73UD12C700PA Item: B301784 1200 V / 1300 V 700 A 150 kA REQUEST QUOTE
PC73UD11C800PA Item: Z301966 1100 V / 1200 V 800 A 150 kA REQUEST QUOTE
PC73UD10C900PA Item: F302685 1000 V / 1100 V 900 A 167 kA REQUEST QUOTE
PC73UD90V10CPA Item: R302718 900 V / 1000 V 1000 A 150 kA REQUEST QUOTE
PC73UD90V11CPA Item: Q302717 900 V / 1000 V 1100 A 150 kA REQUEST QUOTE
PC73UD85V14CPA Item: G302686 900 V / 1000 V 1250 A 150 kA REQUEST QUOTE
A090UD73PA1400 Item: G302709 850 V / 900 V 1400 A 150 kA REQUEST QUOTE
Standard: IEC 60269-4 / UL Recognized (E76491)  |  Rating: 600V to 1250V (AC)  |  Class: aR (Semiconductor Protection) Size 73

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