Hammond Power Solutions FG4 Finger Guard Kit Brand: Hammond Power Solutions. Part Number: FG4. HPS Imperator Finger Guard Kit, Fused, 1.8 in H x 6.2 in W x 3.05 in D, For Use With: MBMH, MGJ, MLI 250 VA, AJ, AR, MQMJ, QR, SP, PP 750 VA and All 350, 500 VA Encapsulated and Commercial Potted Industrial Control Transformer, Plastic, Clear. Additional Description: HPS -FG4 (O) PH CNTL FINGER GUARD KIT. Catalog Description: Control Transformer Accessories - Optional Fused Finger Guard Kits, 250 VA For MBMH, MGJ, MLI Suffixes, 350, 500 VA For All Suffixes, 750 VA For AJ, AR, MQMJ, QR, SP, PP Suffixes..