LITTELFUSE SPDN-B120-1P Alternate CITEL M50-120S-B
Surge Protective Device (SPD)

M50-120S-B	SPDN-B120-1P
Intended Application System
System Voltage	120Vac
Number of Phases	Single Phase
Conductors	2 Wire + Ground
Configuration	Single

PRODUCT COMPARISON TABLE

This page collects publicly available data from ul.com and assembles a side by side reference table for a convenient product cross reference.

Manufacturer		LITTELFUSE
UL File #	E326289	E320116
Model	M50-120S-B	SPDN-B120-1P
Product Image
UL.com Ratings	UL CARD	UL CARD
UL APPROVAL	LISTED	LISTED
UL MARK
SPD Type	1	1
Volt (V)	120	120
AC/DC DC PV	AC	AC
Phase	1S	1S
Amps (A)	n/a	n/a
Ambient Min (C)	-35	-35
Ambient Max (C)	80	85
Mode
VPR (Vpk)
L-L L-N L-G N-G	- 700 1200 1200	- 140 140 120
MCOV
L-L L-N L-G N-G	- 700 700 600	- 180 180 180
In (kA)	20	20
SCCR (kA)	150	200
Additional Data Sheet Ratings
Surge Current Rating (kA)	50	-
Protection Circuit	MOV-GSG	TMOV
Leakage Current	No	-
TOV Optimized	No	-
Diagnostics	LED Indicator & Remote Contacts	LED Indicator & Remote Contacts
Environmental Rating	6(IP66)	Polycarbonate NEMA 4x
# of Wires	3	3
Modes of Protection	Common Mode Differential Mode	Common Mode Differential Mode
Warranty	10-years	-

Determining the acceptability of an SPD for UL 508A Control Panels and All Other UL Listed Equipment

The UL inspector will first consider the SPD type when determining it’s acceptability for a given application or piece of equipment. This will include UL 508A as well as all other UL Listed equipment. The first level compliance is based on the UL Approval (LISTED or RECOGNIZED) of the SPD or UL SPD Type and it’s Suitable Ratings. This means that it has to meet all safety, performance, environmental and electrical system ratings of the application. If any of these criteria are not fully met, it will require a Procedure Description, a File Update and/or Additional Testing. These actions will require additional costs that may be substantial. For this reason, it is in the interest of the specifier to use UL LISTED SPD’s to eliminate any uncertainty or to make sure the UL RECOGNIZED SPD is selected at the time of UL submittal of the equipment.

Approval Considerations Table based on UL SPD Type

UL Mark	UL1449 SPD Type	Suitable Ratings	Procedure Described	File Update or Additional Testing	Notes
	1 2	Yes	No	No	The only requirement is that the SPD must match electrical and environmental ratings of the UL 508A Control Panel. A UL field inspection of the control panel with the SPD installed is required as a part of a standard follow-up service visit.
	1CA 2CA 4CA 5	Yes	Yes	Yes	Yes – All UL recognized SPD’s require a UL engineering evaluation of the SPD’s existing UL1449 E–file. This will result, at a minimum, in a cost to update the UL file and may also require testing that would result in additional costs.

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