0257001. Fuses - 257 Series - ATO® Fast-Acting Automotive Blade Fuse

Part Number: 0257001.

Technology: Fuses

Series: 257

257 Series Data Sheet
Littelfuse_BladeFuse_ATO32V.pdf
(151,081 bytes)
Last Uploaded: January 14, 2010

257 Series - ATO® Fast-Acting Automotive Blade Fuse

The ATO� Fuse was designed and patented by Littelfuse in 1976 and set the standard for automotive circuit protection. It features industry standard color coding to indicate amperage rating.

Help	Property	Value
It is established by Littelfuse as a value of current which the fuse, fuseholder, fuse clip or other fuse accessory can carry, based on a controlled set of test conditions. Close Info	Ampere Rating (A)	1
Refers to how rapidly the fuse responds to various current overloads. Fuse characteristics can be classified into three general categories: very fast-acting, fast-acting or Slo-Blo® (time delay)fuse. The distinguishing feature of Slo-Blo fuses is that these fuses have additional thermal inertia (surge withstand) designed to tolerate normal initial or start-up overload pulse. Close Info	Opening	Yes
RMS Surge (Non-repetitive) On-state Fusing Current- Measure of let-through energy in terms of current and time for fusing purposes. Close Info	Nominal Melting I²T (A²sec)	0.4
Cold resistance is the resistance obtained using a measuring current of no more than 10% of the fuse's nominal rated current. The factory should be consulted if this parameter is critical to the design in question. Close Info	Nominal Cold Resistance (Ohms)	0.123
Close Info	Interrupt Rating	1000A@32VDC
Nominal Voltage Drop (mV) Close Info	Nominal Voltage Drop (mV)	176
Color or Alpha-Numeric code used to define the amp rating of the device for ease-of-maintenance and quality checks. Close Info	Marking Code	Black

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Design Support

Certification

UL FHXT - AU1410
UL_FHXT.PDF (19 K)

UL_JFHR2-E71611
March 17, 2009
UL_JFHR2E71611.pdf (456 K)

Plant Certifications

Associated Series

• FH2 - (Blockholder) 80V

• FLR 42V Fuseholder

• FLR 80V 2-pin PCB Fuseholder

Environmental Data

Environmental Info

RoHS Date: 6/7/02
PbFree Date: 6/7/02

Part# Identifier: Std p/n
ICP Test Reports
ICPTest 257.pdf
China RoHS Reports
ChinaRoHS 257.pdf

	UL FHXT - AU1410 UL_FHXT.PDF (19 K)
	UL_JFHR2-E71611 March 17, 2009 UL_JFHR2E71611.pdf (456 K)

	Mexico/Piedras Negras ISO 14001 Littelfuse_Mexico_PiedrasNegras_ISO14001.pdf (37 K)
	Mexico/Piedras Negras ISO/TS 16949 Littelfuse_Mexico_ISO-TS16949-2009.pdf (71 K)

•	FH2 - (Blockholder) 80V
•	FLR 42V Fuseholder
•	FLR 80V 2-pin PCB Fuseholder

Electrical Characteristics

Design Support

Environmental Data