Hammond 187F10 10V CT 100VA Chassis Mount Power Transformer

The 187F10 is a 100 VA, F-size transformer delivering a 10 V center-tapped secondary at 10 A from a single 115 VAC primary, and has a published drawing with its test data. It belongs to the 187 series of chassis-mount, low-voltage power transformers, which run on 50/60 Hz and suit OEM engineers and panel builders who need a fixed step-down secondary with a center tap. If you need a dual 115/230 VAC primary with the same secondary, the ordering table pairs this part with the 186F10.

Construction is an economical open-style channel frame for chassis mounting. Split bobbin construction removes the need for an electrostatic shield, insulation is Class B (130 °C), and temperature rise is designed not to exceed Class A for longer life. Combination solder or quick connect terminals allow either soldered leads or quick connect wiring.

In the F-size frame, the 187F10 measures 4.03 in (102 mm) long, 2.25 in (57 mm) deep not including terminals (2.62 in (67 mm) to the terminal), and 2.56 in (65 mm) high, with 3.50 in (89 mm) mounting centers. Shipping weight is 2.7 lbs (1.22 kg).

The 187F10 drawing lists acceptance data measured at 115 V, 60 Hz on terminals 2 and 4: excitation current of 126 mA max, a no-load secondary of 11.17 V ±2% across terminals 6 to 10 (5.583 V ±2% per half, with terminal 8 as the center tap), primary DC resistance of 4.209 ±20% and secondary DC resistance of 0.040 ±20% at 20°C. Primary-to-secondary hi-pot is 2500 V, 60 Hz, 1 sec, and the terminals are brass.

The series is hi-pot tested to 2 KV RMS, UL listed (# E207860) Type 3AH and CSA Certified. This part is listed as RoHS and REACH compliant.