0000001171 00000 n www.schurterinc.com Fuse Selection Guide 2 Purpose of Fuses > Circuit protection is critical, and in many cases required, in electrical and electronic products. 0000000016 00000 n A-C rated fuses should not be applied in D-C voltage circuits endobj When a conductor is oversized to prevent excess voltage drop, size the fuses … The other A-C fuse ratings remain the same at applied voltages below the fuse voltage rating. %���� All Products . For cases not covered by the standard selection tables, the applicable fuse selection rules and criteria must be respected according to the type of load and the environment (fuse-switch combination). Repair Overview. Selection of fuses for the protection of transformers page 2 d a te 10/95 - B¥3¥3-revised 04/ 2004 Generally, to select the right fuse, it is sufficient to use the SM6 fuse selection tables (see page 11). %PDF-1.4 %���� 0000008296 00000 n <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Use the Blue Sea Systems Circuit Wizard to select the correct wire size, circuit breaker or fuse type and amperage, and fuse holder. 4) Voltage rating. Fuses with an A-C voltage rating may be applied at system voltages below the fuse voltage rating, but not at voltages above the fuse voltage rating. Fuses selected from this column are intended to provide short circuit and ground-fault protection for motor branch circuits. 2. Before choosing the interrupting rating, we need to know the prospective short-circuit current of the supply circuit. 0000003396 00000 n startxref ���� JFIF � � �� lExif II* 1 J \ Q . In selecting a fuse, we must consider most of the fuse parameters: 1) Current rating. Buss Fuse Selection Chart (600 Volts or Less) Circuit Load Ampere Fuse Symbol Voltage Interrupting Remarks Rating Type Rating (a-c) Class Rating Page (KA) Conventional Dimensions—Class RK1, RK5 (0-600A), L (601-6000A) All type loads 0-600A LOW-PEAK® LPN-RK_SP 250V RK1†† 300 All-purpose fuses. Table of Contents Page Fuse Characteristics, Terms and Consideration Factors 2–4 Fuse Selection Checklist 5–7 PTC Characteristics and Terms 8–9 PTC Product Applications 10 Typical PTC Circuit Protection Designs 11 Standards 12–14 PTC Selection Worksheet 15 Fuse and PTC Products Selection Guide 16–18 Packaging and Part Numbering 19 0 0000002896 00000 n hބW�r�F��+���o8'Ŏ]I��N�Tr�"7!x���gf @��Te�$w==݋��9l����v�����q�c���d1g�@����a�_ܾ�94�|#ݴ�V �s\�\�C�R�2ߩ )+���*)FȢ��1|��t�>����2LX�����i� � �qėaD�ɧz# �m˿W�R�ܕ_��K�y���8c�eO�"NyM����};��k��A����j1��,��e�"����X. endobj Q Q Adobe ImageReady �� ȯ �� C Fuses are overcurrent devices that protect electrical and electronic devices by melting and opening a circuit to prevent excessive current from causing damage or starting fires. In selecting the fuse from the time-current curves, the tolerance on current rates given in the standards should not be neglected (± 20% on current value). > Fuses are an inexpensive and effective way to protect your device from damage due to overcurrent conditions. Use Class R fuse clips with Class R fuses to prevent installation of fuses with less interrupting rating or current limitation. xref Through proper fuse selection, you can minimize risks and failures so that an electronic product retains its competitive edge. 0000003174 00000 n Fuses sized in accordance with Column 5 must be used in conjunction with properly sized motor overload protection such as overload relays or solid state motor controllers (430.32). 0000002931 00000 n 800-575-5562. (�UV���$6O٨�w�D:p�2흖�ni۶��Ī�m3H��m�w%5�h��5�X&� �u�ؼY�,���������ջ:�1~b6�v'D{��:�۩����?�wv� > Typical I2t-values at 10*I n for Schurter 1 A time-lag T fuses … 0000001504 00000 n �F۹��vA�a���_�T:��"lb��S��/�nj�5��i��v� �]=���[�s�w�P�?�o�j(���X�uuU8�����^�F�Ӯ�7� ����$��U%������7����: NI,׫��2��mt��� ���O�|,:�Ǫ���%1�]O�1˶�+F�kf� �"��1��TYC��C��;��R����� _�:��� �ƴU�v��� D�p��������٠rb|�q\�'L̟�9�qm�� ��q��]KCظ��0�+=3ֳ�������h����h{�J�Rg��ĥ�Ԫԥh"�ƪ��� ���t�! stream 0000005603 00000 n 0000002120 00000 n 3) Interrupting current rating. Once the current value is determined, then a fuse rating should be selected as to be 135% of this value (taken to the next standard value). Get Started > The Circuit Wizard app is available for Android™ devices & … Buss Fuse Selection Chart (600 Volts or Less) Circuit Load Ampere Fuse Symbol Voltage Interrupting Remarks Rating Type Rating (a-c) Class Rating Page (KA) Conventional Dimensions—Class RK1, RK5 (0-600A), L (601-6000A) All type loads 0-600A LOW-PEAK® LPN-RK_SP 250V RK1†† 300 All-purpose fuses… <> endstream endobj stream trailer 2 0 obj The second criteria is the frequency of starting the motor which can lead to the aging of the fuse, which in turn might result in changes in the characteristics of the fuse. 0000003624 00000 n 3. 800-575-5562. ",#(7),01444'9=82. <>>> From the circuit, we know the circuit voltage, so we can readily choose the fuse voltage rating.