AC Machine Type

For heavy duty machine applications, RoMan’s AC Machine Type water-cooled transformers are ideal for press, seam, rocker arm, cross wire and other welding applications. Available in various primary voltages, frequencies, and secondary voltages, both the size and capabilities of our Machine Type units can also be designed to meet specific application requirements.

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• 440 Volt, 60 Hz

• KVA Range: 20 KVA – 500 KVA @ 50% duty cycle

• RWMA standard machine pad sizes and hole spacing

• Fully epoxy encapsulated to ensure long life

• Optional accessories:

-Available in-side and remote mounted Switch Gear / Tap Switch

-Over-temperature thermoswitch

• Also available in other primary voltages and frequencies

Machine Type Transformers: ML - MA Frame

100 - 125 KVA
10 - 3/4" x 13 - 3/8"
* To request a quote on a single Fixture Type Transformer, click the "Model Number" link.
** To request a quote on multiple Fixture Type Transformers, check the "GET QUOTE" box(s) and press the Quote Request button.

KVA Rating @ 50% Duty Cycle	Frame Size	Secondary Turns Ratio																Tap Switch Location	Model Number	Drawing (PDF)	RWMA Pad Size	Approx Weight Lbs	KVA Rating @ 50% Duty Cycle
		Tap 1		Tap 2		Tap 3		Tap 4		Tap 5		Tap 6		Tap 7		Tap 8
		Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	End Mount	M446100ML1BMLX	R1471	1	433	100
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	End Mount	M446100ML1BNLX	R1471	2	436	100
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	End Mount	M446100ML1BOLX	R1471	3	440	100
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	Side Mount	M446100ML1FMLX	R1472	1	453	100
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	Side Mount	M446100ML1FNLX	R1472	2	456	100
100	ML	80:1	5.50	74:1	5.94	68:1	6.47	62:1	7.09	57:1	7.71	52:1	8.46	48:1	9.16	44:1	10.00	Side Mount	M446100ML1FOLX	R1472	3	460	100
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	End Mount	M446125MA1BMLX	R1471	1	503	125
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	End Mount	M446125MA1BNLX	R1471	2	506	125
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	End Mount	M446125MA1BOLX	R1471	3	514	125
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	Side Mount	M446125MA1FMLX	R1472	1	523	125
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	Side Mount	M446125MA1FNLX	R1472	2	526	125
125	MA	66:1	5.50	60:1	7.33	55:1	8.00	50:1	8.80	46:1	9.56	42:1	10.47	39:1	11.28	36:1	12.20	Side Mount	M445125MA1FOLX	R1472	3	530	125

Machine Type Transformers: NB - NL Frame

50 to 120 KVA
9 - 1/2" x 13 - 3/8"
* To request a quote on a single Fixture Type Transformer, click the "Model Number" link.
** To request a quote on multiple Fixture Type Transformers, check the "GET QUOTE" box(s) and press the Quote Request button.

KVA Rating @ 50% Duty Cycle	Frame Size	Secondary Turns Ratio																Tap Switch Location	>Model Number	Drawing (PDF)	RWMA Pad Size	Approx Weight Lbs	KVA Rating @ 50% Duty Cycle
		Tap 1		Tap 2		Tap 3		Tap 4		Tap 5		Tap 6		Tap 7		Tap 8
		Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts
50	NB	110:1	4.00	96:1	4.58	83:1	5.30	73:1	6.03	63:1	6.98	55:1	7.90	NA	NA	NA	NA	End Mount	M44650NB1BMLX	R1206	1	336	50
50	NB	110:1	4.00	96:1	4.58	83:1	5.30	73:1	6.03	63:1	6.98	55:1	7.90	NA	NA	NA	NA	End Mount	M44650NB1BNLX	R1206	2	339	50
50	NB	110:1	4.00	96:1	4.58	83:1	5.30	73:1	6.03	63:1	6.98	55:1	7.90	NA	NA	NA	NA	Side Mount	M44650NB1FMLX	R1306	1	356	50
50	NB	110:1	4.00	96:1	4.58	83:1	5.30	73:1	6.03	63:1	6.98	55:1	7.90	NA	NA	NA	NA	Side Mount	M44650NB1FNLX	R1306	2	359	50
50	NL	119:1	3.60	98:1	4.48	81:1	5.43	69:1	6.37	61:1	7.21	54:1	8.14	49:1	8.97	44:1	10.00	End Mount	M44650NL1BMLX	R1206	1	386	50
50	NL	119:1	3.60	98:1	4.48	81:1	5.43	69:1	6.37	61:1	7.21	54:1	8.14	49:1	8.97	44:1	10.00	End Mount	M44650NL1BNLX	R1206	2	389	50
50	NL	119:1	3.60	98:1	4.48	81:1	5.43	69:1	6.37	61:1	7.21	54:1	8.14	49:1	8.97	44:1	10.00	Side Mount	M44650NL1FMLX	R1306	1	406	50
50	NL	119:1	3.60	98:1	4.48	81:1	5.43	69:1	6.37	61:1	7.21	54:1	8.14	49:1	8.97	44:1	10.00	Side Mount	M44650NL1FNLX	R1306	2	409	50
75	NL	77:1	5.70	71:1	6.19	65:1	6.76	59:1	7.45	54:1	8.14	50:1	8.80	47:1	9.36	44:1	10.00	End Mount	M44675NL1BMLX	R1206	1	386	75
75	NL	77:1	5.70	71:1	6.19	65:1	6.76	59:1	7.45	54:1	8.14	50:1	8.80	47:1	9.36	44:1	10.00	End Mount	M44675NL1BNLX	R1206	2	389	75
75	NL	77:1	5.70	71:1	6.19	65:1	6.76	59:1	7.45	54:1	8.14	50:1	8.80	47:1	9.36	44:1	10.00	Side Mount	M44675NL1FMLX	R1306	1	406	75
75	NL	77:1	5.70	71:1	6.19	65:1	6.76	59:1	7.45	54:1	8.14	50:1	8.80	47:1	9.36	44:1	10.00	Side Mount	M44675NL1FNLX	R1306	2	409	75
100	NL	65:1	6.80	60:1	7.33	55:1	8.00	51:1	8.62	47:1	9.36	44:1	10.00	NA	NA	NA	NA	End Mount	M446100NL1BMLX	R1206	1	386	100
100	NL	65:1	6.80	60:1	7.33	55:1	8.00	51:1	8.62	47:1	9.36	44:1	10.00	NA	NA	NA	NA	End Mount	M446100NL1BNLX	R1206	2	389	100
100	NL	65:1	6.80	60:1	7.33	55:1	8.00	51:1	8.62	47:1	9.36	44:1	10.00	NA	NA	NA	NA	Side Mount	M446100NL1FMLX	R1306	1	406	100
100	NL	65:1	6.80	60:1	7.33	55:1	8.00	51:1	8.62	47:1	9.36	44:1	10.00	NA	NA	NA	NA	Side Mount	M446100NL1FNLX	R1306	2	409	100
120	NA	60:1	7.33	56:1	7.85	52:00	8.46	48:1	9.16	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	End Mount	M446120NA1BMLX	R1206	1	435	120
120	NA	60:1	7.33	56:1	7.85	52:00	8.46	48:1	9.16	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	End Mount	M446120NA1BNLX	R1206	2	438	120
120	NA	60:1	7.33	56:1	7.85	52:00	8.46	48:1	9.16	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	Side Mount	M446120NA1FMLX	R1306	1	455	120
120	NA	60:1	7.33	56:1	7.85	52:00	8.46	48:1	9.16	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	Side Mount	M446120NA1FNLX	R1306	2	458	120

Machine Type Transformers: PL - PA Frame

150 - 200 KVA
12 - 1/2" x 13 - 3/8"
* To request a quote on a single Fixture Type Transformer, click the "Model Number" link.
** To request a quote on multiple Fixture Type Transformers, check the "GET QUOTE" box(s) and press the Quote Request button.

KVA Rating @ 50% Duty Cycle	Frame Size	Secondary Turns Ratio																Tap Switch Location	Model Number	Drawing (PDF)	RWMA Pad Size	Approx Weight Lbs	KVA Rating @ 50% Duty Cycle
		Tap 1		Tap 2		Tap 3		Tap 4		Tap 5		Tap 6		Tap 7		Tap 8
		Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts
150	PL	69:1	6.40	63:1	6.98	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	40:1	11.00	End Mount	M446150PL1BNLX	R1093	2	567	150
150	PL	69:1	6.40	63:1	6.98	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	40:1	11.00	End Mount	M446150PL1BOLX	R1093	3	572	150
150	PL	69:1	6.40	63:1	6.98	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	40:1	11.00	Side Mount	M446150PL1FNLX	R1305	2	577	150
150	PL	69:1	6.40	63:1	6.98	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	40:1	11.00	Side Mount	M446150PL1FOLX	R1305	3	592	150
200	PL	59:1	7.45	55:1	8.00	51:1	8.62	48:1	9.16	45:1	9.77	43:1	10.23	41:1	10.73	39:1	11.28	End Mount	M446200PL1BNLX	R1093	2	567	200
200	PL	59:1	7.45	55:1	8.00	51:1	8.62	48:1	9.16	45:1	9.77	43:1	10.23	41:1	10.73	39:1	11.28	End Mount	M446200PL1BOLX	R1093	3	572	200
200	PL	59:1	7.45	55:1	8.00	51:1	8.62	48:1	9.16	45:1	9.77	43:1	10.23	41:1	10.73	39:1	11.28	Side Mount	M446200PL1FNLX	R1305	2	587	200
200	PL	59:1	7.45	55:1	8.00	51:1	8.62	48:1	9.16	45:1	9.77	43:1	10.23	41:1	10.73	39:1	11.28	Side Mount	M446200PL1FOLX	R1305	3	592	200
200	PA	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	34:1	12.94	End Mount	M446200PA1BNLX	R1093	2	671	200
200	PA	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	34:1	12.94	End Mount	M446200PA1BOLX	R1093	3	676	200
200	PA	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	34:1	12.94	Side Mount	M446200PA1FNLX	R1305	2	691	200
200	PA	57:1	7.71	53:1	8.30	49:1	8.97	45:1	9.77	42:1	10.47	39:1	11.28	36:1	12.22	34:1	12.94	Side Mount	M446200PA1FOLX	R1305	3	696	200

Machine Type Transformers: V - VA - U - UA Frame

250 - 500 KVA
13 - 3/8" x 20 - 3/4" and 16 - 1/2" x 20 - 3/4"
* To request a quote on a single Fixture Type Transformer, click the "Model Number" link.
** To request a quote on multiple Fixture Type Transformers, check the "GET QUOTE" box(s) and press the Quote Request button.

KVA Rating @ 50% Duty Cycle	Frame Size	Secondary Turns Ratio																Tap Switch Location	Model Number	Drawing (PDF)	RWMA Pad Size	Approx Weight Lbs	KVA Rating @ 50% Duty Cycle
		Tap 1		Tap 2		Tap 3		Tap 4		Tap 5		Tap 6		Tap 7		Tap 8
		Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts	Turns Ratio	Volts
250	V	58:1	7.60	53:1	8.30	49:1	8.97	45:1	9.77	41:1	10.73	38:1	11.57	35:1	12.57	32:1	13.80	End Mount	M446250V1BOLX	R1286	3	1005	250
300	VA	51:1	8.62	47:1	9.36	43:1	10.23	39:1	11.28	36:1	12.22	33:1	13.33	30:1	14.66	281	15.71	End Mount	M446300VA1BOLX	R1286	3	1115	300
300	VA	51:1	8.62	47:1	9.36	43:1	10.23	39:1	11.28	36:1	12.22	33:1	13.33	30:1	14.66	28:1	15.71	End Mount	M446300VA1BPLX	R1286	4	1130	300
400	U	50:1	8.80	46:1	9.56	42:1	10.47	38:1	11.57	34:1	12.94	31:1	14.19	28:1	15.71	26:1	16.92	End Mount	M446400U1BPLX	R1285	4	1499	400
500	UA	45:1	9.80	31:1	13.19	37:1	11.89	34:1	12.94	31:1	14.19	28:1	15.71	26:1	16.92	24:1	18.30	End Mount	M446500UA1BPLX	R1285	4	1579	500